Tetrahydroquinazolin-4(3H)-one-related and tetrahydropyrido[2,3-D]pyrimidin-4(3H)-one-related compounds, compositions and methods for their use

ABSTRACT

Compounds are provided having the formula: 
                         
wherein variables A 1 , A 2 , A 3 , A 4 , R 1 , R 2 , R 3 , R 4 , Q and L are as described herein. The subject compounds are useful for treatment of inflammatory and immune conditions and diseases. Compositions and methods of treatment using the subject compounds are also provided. For example, the subject methods are useful for treatment of inflammatory and immune disorders and disease such as multiple sclerosis, rheumatoid arthritis, psoriasis, and inflammatory bowel disease.

1. CROSS-REFERENCE TO RELATED APPLICATION

This application claims the benefit of U.S. provisional application No. 60/583,823, filed Jun. 28, 2004, the disclosure of which is incorporated herein by reference in its entirety.

2. FIELD OF THE INVENTION

The present invention relates to novel modulators of the CXCR3 receptor, compositions comprising the novel compounds and methods of their use for the treatment of, for example, inflammatory and immunoregulatory disorders and diseases, including asthma and allergic diseases, as well as autoimmune pathologies such as rheumatoid arthritis, multiple sclerosis, inflammatory bowel disease, psoriasis and atherosclerosis.

3. BACKGROUND OF THE INVENTION

Chemokines are chemotactic cytokines that are released by a wide variety of cells to attract macrophages, T cells, eosinophils, basophils and neutrophils to sites of inflammation (reviewed in Schall, Cytokine, 3:165-183 (1991), Schall, et al., Curr. Opin. Immunol., 6:865-873 (1994) and Murphy, Rev. Immun., 12:593-633 (1994)). In addition to stimulating chemotaxis, other changes can be selectively induced by chemokines in responsive cells, including changes in cell shape, transient rises in the concentration of intracellular free calcium ions ([Ca²⁺])_(i), granule exocytosis, integrin upregulation, formation of bioactive lipids (e.g., leukotrienes) and respiratory burst, associated with leukocyte activation. Thus, the chemokines are early triggers of the inflammatory response, causing inflammatory mediator release, chemotaxis and extravasation to sites of infection or inflammation.

There are four classes of chemokines, CXC(α), CC(β), C(γ), and CX₃C(δ), depending on whether the first two cysteines are separated by a single amino acid (C—X—C), are adjacent (C—C), have a missing cysteine pair (C), or are separated by three amino acids (CX₃C). The α-chemokines, such as interleukin-8 (IL-8), melanoma growth stimulatory activity protein (MGSA), and stromal cell derived factor 1 (SDF-1) are chemotactic primarily for neutrophils and lymphocytes, whereas β-chemokines, such as RANTES, MIP-1α, MIP-1β, monocyte chemotactic protein-1 (MCP-1), MCP-2, MCP-3 and eotaxin are chemotactic for macrophages, T-cells, eosinophils and basophils (Deng, et al., Nature, 381:661-666 (1996)). The C chemokine lymphotactin shows specificity for lymphocytes (Kelner, et al., Science, 266:1395-1399 (1994)) while the CX₃C chemokine fractalkine shows specificity for lymphocytes and monocytes (Bazan, et al., Nature, 385:640-644 (1997)).

Chemokines bind specific cell-surface receptors belonging to the family of G-protein-coupled seven-transmembrane-domain proteins (reviewed in Horuk, Trends Pharm. Sci., 15:159-165 (1994)) termed “chemokine receptors.” On binding their cognate ligands, chemokine receptors transduce an intracellular signal through the associated heterotrimeric G protein, resulting in a rapid increase in intracellular calcium concentration. There are at least twelve human chemokine receptors that bind or respond to β-chemokines with the following characteristic pattern: CCR1 (or “CKR-1” or “CC-CKR-1”) MIP-1α, MIP-1β, MCP-3, RANTES (Ben-Barruch, et al., J. Biol. Chem., 270:22123-22128 (1995); Neote, et al., Cell, 72:415-425 (1993)); CCR2A and CCR2B (or “CKR-2A”/“CKR-2A” or “CC-CKR-2A”/“CC-CKR2A”) MCP-1, MCP-3, MCP-4; CCR3 (or “CKR-3” or “CC-CKR-3”) eotaxin, RANTES, MCP; (Ponath, et al., J. Exp. Med., 183:2437-2448 (1996)); CCR4 (or “CKR-4” or “CC-CKR-4”) TARC, MDC (Imai, et al., J. Biol. Chem., 273:1764-1768 (1998)); CCR5 (or “CKR-5” or “CC-CKR-5”) MIP-1α, RANTES, MIP-1β (Sanson, et al., Biochemistry, 35:3362-3367 (1996)); CCR6 MIP-3 alpha (Greaves, et al., J. Exp. Med., 186:837-844 (1997)); CCR7 MIP-3 beta and 6Ckine (Campbell, et al., J. Cell. Biol., 141:1053-1059(1998)); CCR8 I-309, HHV8 vMIP-I, HHV-8 vMIP-II, MCV vMCC-I (Dairaghi, et al., J. Biol. Chem., 274:21569-21574 (1999)); CCR9 TECK (Zaballos, et al., J. Immunol., 162:5671-5675 (1999)), D6 MIP-1 beta, RANTES, and MCP-3 (Nibbs, et al., J. Biol. Chem., 272:32078-32083 (1997)), and the Duffy blood-group antigen RANTES, MCP-1 (Chaudhun, et al., J. Biol. Chem., 269:7835-7838 (1994)).

Chemokine receptors, such as CCR1, CCR2, CCR2A, CCR2B, CCR3, CCR4, CCR5, CCR6, CCR7, CCR8, CCR9, CXCR1, CXCR2, CXCR3, CXCR4, CXCR5, CX₃CR1, and XCR1 have been implicated as being important mediators of inflammatory and immunoregulatory disorders and diseases, including asthma and allergic diseases, as well as autoimmune pathologies such as rheumatoid arthritis and atherosclerosis.

The CXCR3 chemokine receptor is expressed primarily in T lymphocytes, and its functional activity can be measured by cytosolic calcium elevation or chemotaxis. The receptor was previously referred to as GPR9 or CKR-L2. Its chromosomal location is unusual among the chemokine receptors in being localized to Xq13. Ligands that have been identified that are selective and of high affinity are the CXC chemokines, IP10, MIG and ITAC.

The highly selective expression of CXCR3 makes it an ideal target for intervention to interrupt inappropriate T cell trafficking. The clinical indications for such intervention are in T-cell mediated autoimmune diseases such as multiple sclerosis, rheumatoid arthritis, and type I diabetes. Inappropriate T-cell infiltration also occurs in psoriasis and other pathogenic skin inflammation conditions, although the diseases may not be true autoimmune disorders. In this regard, up-regulation of IP-10 expression in keratinocytes is a common feature in cutaneous immunopathologies. Inhibition of CXCR3 can be beneficial in reducing rejection in organ transplantation. Ectopic expression of CXCR3 in certain tumors, especially subsets of B cell malignancies, indicates that selective inhibitors of CXCR3 will have value in tumor immunotherapy, particularly attenuation of metastasis.

In view of the clinical importance of CXCR3, compounds that modulate CXCR3 function can be used for the development of new therapeutic agents. Such compounds are provided herein.

4. SUMMARY OF THE INVENTION

The present invention provides compounds that are useful in the treatment or prevention of certain inflammatory and immunoregulatory disorders and diseases, including asthma, psoriasis, inflammatory bowel disease and allergic diseases, as well as autoimmune pathologies such as rheumatoid arthritis and multiple sclerosis.

In one aspect, the compounds provided herein have the general formula (I):

wherein Q is a is a member selected from the group consisting of a —C(O)—, —CH₂CO—, —CH₂SO— and —CH₂SO₂—; L is a bond or (C₁-C₅)alkylene; A¹, A² and A³ are independently selected from the group consisting of C(R′)(R″) and C(O); A⁴ is C(R′)(R″) or N(R′″); each R′ and R″ is independently selected from the group consisting of hydrogen, halogen, (C₁-C₈)alkyl, (C₂-C₈)heteroalkyl, fluoro(C₁-C₄)alkyl (where one or more fluorine atoms may be substituted on one or more carbons), aryl, heteroaryl, aryl(C₁-C₈)alkyl and heteroaryl(C₁-C₈)alkyl, optionally, R′ and R″ groups on adjacent carbon atoms may be combined to form a 5- or 6-membered fused ring, and R′ and R″ groups attached to the same carbon atom may be combined to form a 3-8 membered spirocyclic ring; R′″ is selected from the group consisting of hydrogen, (C₁-C₈)alkyl and (C₂-C₈)heteroalkyl; R¹ is heteroaryl or aryl; R² is selected from the group consisting of hydrogen, halogen, (C₁-C₁₀)alkyl, (C₂-C₁₀)heteroalkyl, hetero(C₁-C₁₀)cycloalkyl, (C₁-C₁₀)alkylaryl and (C₂-C₁₀)heteroalkylaryl, optionally R² may be combined with L to form a 5-, 6-, 7- or 8-membered ring containing from 1 to 3 heteroatoms selected from the group consisting of N, O and S; R³ is absent or is a member selected from the group consisting of —H, —CHR⁶R⁷, —S(O)_(m)R⁵, —S(O)_(m)N(R⁸)R⁹, S(O)_(m)N(R⁸)CH₂R⁶, N(R⁸)SO₂R⁵, —N(R⁸)CH₂R¹⁰,

or optionally, R³ may be combined with R² to form a 4-, 5-, 6-, 7- or 8-membered ring containing from 1 to 3 heteroatoms selected from the group consisting of N, O and S; R⁵ is selected from the group consisting of (C₁-C₈)alkyl, (C₂-C₈)heteroalkyl, aryl and heteroaryl; R⁶ and R⁷ independently are hydrogen, (C₁-C₈)alkyl or (C₂-C₈)heteroalkyl; R⁸ is hydrogen, (C₁-C₈)alkyl, (C₂-C₈)heteroalkyl, heteroaryl or aryl; R⁹ is (C₁-C₈)alkyl; R¹⁰ is aryl; Z is CH or N; X is a bond, (C₁-C₆)alkylene or (C₁-C₆)heteroalkylene; Y is (C₁-C₆)alkylene; the subscript m is 0, 1 or 2; and R⁴ is a member selected from the group consisting of (C₁-C₂₀)alkyl, (C₂-C₂₀)heteroalkyl, heteroaryl, aryl, heteroaryl(C₁-C₆)alkyl, heteroaryl(C₂-C₆)heteroalkyl, aryl(C₁-C₆)alkyl and aryl(C₂-C₆)heteroalkyl. In certain embodiments, A⁴ is not NH when A¹, A² and A³ are CH₂, R¹ is 4-(2,2,2-trifluoroethoxy)phenyl, R² is methyl, R³ is 3-picolyl and Q is C(O), -Q-R⁴ taken together is

and L is —CH₂—.

The compounds of the invention include pharmaceutically acceptable salts, solvates or prodrugs thereof.

In another aspect, the present invention provides pharmaceutical compositions comprising a compound of formula (I) and a pharmaceutically acceptable excipient or carrier.

In a further aspect, the present invention provides methods for the treatment or prevention of an inflammatory or immune condition or disorder, comprising administering to a subject in need of such treatment or prevention a therapeutically effective amount of a compound of formula (I). Preferred subjects for the methods of the invention include mammals such as humans.

The present invention also provides methods for the treatment or prevention of a condition or disorder mediated by the CXCR3 chemokine receptor, comprising administering to a subject in need of such treatment or prevention a therapeutically effective amount of a compound of formula (I).

The present invention also provides methods for the modulation of CXCR3, comprising contacting a cell with a compound of formula (I).

The present invention further provides methods for the modulation of CXCR3, comprising contacting a CXCR3 protein with a compound of formula (I).

In addition, the present invention provides methods of making compounds of formula (I).

5. BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates a general synthesis scheme for preparation of compounds of the invention.

FIG. 2 illustrates a general synthesis scheme for preparation of compounds of the invention.

FIG. 3 illustrates a general synthesis scheme for preparation of compounds of the invention.

FIG. 4 illustrates a general synthesis scheme for preparation of compounds of the invention.

FIG. 5 illustrates a general synthesis scheme for preparation of compounds of the invention.

FIG. 6 illustrates a general synthesis scheme for preparation of compounds of the invention.

FIG. 7 illustrates a general synthesis scheme for preparation of compounds of the invention.

FIG. 8 illustrates a general synthesis scheme for preparation of compounds of the invention.

FIG. 9 illustrates a general synthesis scheme for preparation of compounds of the invention.

6. DETAILED DESCRIPTION OF THE INVENTION 6.1 Definitions

The term “alkyl,” by itself or as part of another substituent, means, unless otherwise stated, a straight or branched chain, or cyclic hydrocarbon radical, or combination thereof, which may be fully saturated, mono- or polyunsaturated and can include di- and multivalent radicals, having the number of carbon atoms designated (i.e., C₁-C₁₀ means one to ten carbons). Examples of saturated hydrocarbon radicals include groups such as methyl, ethyl, n-propyl, isopropyl, n-butyl, t-butyl, isobutyl, sec-butyl, cyclohexyl, (cyclohexyl)methyl, cyclopropylmethyl, homologs and isomers of, for example, n-pentyl, n-hexyl, n-heptyl, n-octyl, and the like. An unsaturated alkyl group is one having one or more double bonds or triple bonds. Examples of unsaturated alkyl groups include vinyl, 2-propenyl, crotyl, 2-isopentenyl, 2-(butadienyl), 2,4-pentadienyl, 3-(1,4-pentadienyl), ethynyl, 1- and 3-propynyl, 3-butynyl, and the higher homologs and isomers.

The term “alkylene” by itself or as part of another substituent means a divalent radical derived from an alkane, as exemplified by —CH₂CH₂CH₂CH₂—, and further includes those groups described below as “heteroalkylene.” Typically, an alkyl (or alkylene) group will have from 1 to 24 carbon atoms, with those groups having 10 or fewer carbon atoms being preferred in the present invention. A “lower alkyl” or “lower alkylene” is a shorter chain alkyl or alkylene group, generally having eight or fewer carbon atoms.

The terms “alkoxy,” “alkylamino” and “alkylthio” (or thioalkoxy) are used in their conventional sense, and refer to those alkyl groups attached to the remainder of the molecule via an oxygen atom, an amino group, or a sulfur atom, respectively. Similarly, the term dialkylamino refers to an amino group having two attached alkyl groups that can be the same or different.

The term “heteroalkyl,” by itself or in combination with another term, means, unless otherwise stated, a stable straight or branched chain, or cyclic hydrocarbon radical, or combinations thereof, consisting of the stated number of carbon atoms and from one to three heteroatoms selected from the group consisting of O, N, Si and S, and wherein the nitrogen and sulfur atoms may optionally be oxidized and the nitrogen heteroatom may optionally be quaternized. The heteroatom(s) O, N and S may be placed at any interior position of the heteroalkyl group. The heteroatom Si may be placed at any position of the heteroalkyl group, including the position at which the alkyl group is attached to the remainder of the molecule. Examples include —CH₂—CH₂—O—CH₃, —CH₂—CH₂—NH—CH₃, —CH₂—CH₂—N(CH₃—)CH₃, —CH₂—S—CH₂—CH₃, —CH₂—CH₂, —S(O)CH₃, —CH₂—CH₂—S(O)₂—CH₃, —CH═CH—O—CH₃, —Si(CH₃)₃, —CH₂—CH═N—OCH₃, and —CH═CH—N(CH₃)—CH₃. Up to two heteroatoms may be consecutive, such as, for example, —CH₂—NH—OCH₃ and —CH₂—O—Si(CH₃)₃. When a prefix such as (C₂-C₈) is used to refer to a heteroalkyl group, the number of carbons (2-8, in this example) is meant to include the heteroatoms as well. For example, a C₂-heteroalkyl group is meant to include, for example, —CH₂OH (one carbon atom and one heteroatom replacing a carbon atom) and —CH₂SH. The term “heteroalkylene” by itself or as part of another substituent means a divalent radical derived from heteroalkyl, as exemplified by —CH₂—CH₂—S—CH₂CH₂— and —CH₂—S—CH₂—CH₂—NH—CH₂—. For heteroalkylene groups, heteroatoms can also occupy either or both of the chain termini (e.g., alkyleneoxy, alkylenedioxy, alkyleneamino, alkylenediamino, and the like). Still further, for alkylene and heteroalkylene linking groups, no orientation of the linking group is implied.

The terms “cycloalkyl” and “heterocycloalkyl”, by themselves or in combination with other terms, represent, unless otherwise stated, cyclic versions of “alkyl” and “heteroalkyl”, respectively. Additionally, for heterocycloalkyl, a heteroatom can occupy the position at which the heterocycle is attached to the remainder of the molecule. Examples of cycloalkyl include cyclopentyl, cyclohexyl, 1-cyclohexenyl, 3-cyclohexenyl, cycloheptyl, and the like. Examples of heterocycloalkyl include 1-(1,2,5,6-tetrahydropyridyl), 1-piperidinyl, 2-piperidinyl, 3-piperidinyl, 4-morpholinyl, 3-morpholinyl, tetrahydrofuran-2-yl, tetrahydrofuran-3-yl, tetrahydrothien-2-yl, tetrahydrothien-3-yl, 1-piperazinyl, 2-piperazinyl, and the like.

The terms “halo” or “halogen,” by themselves or as part of another substituent, mean, unless otherwise stated, a fluorine, chlorine, bromine, or iodine atom. Additionally, terms such as “haloalkyl,” are meant to include monohaloalkyl and polyhaloalkyl. For example, the term “halo(C₁-C₄)alkyl” is meant to include trifluoromethyl, 2,2,2-trifluoroethyl, 4-chlorobutyl, 3-bromopropyl, and the like.

The term “aryl” means, unless otherwise stated, a polyunsaturated, typically aromatic, hydrocarbon substituent which can be a single ring or multiple rings (up to three rings) which are fused together or linked covalently. The term “heteroaryl” refers to aryl groups (or rings) that contain from zero to four heteroatoms selected from N, O, and S, wherein the nitrogen and sulfur atoms are optionally oxidized, and the nitrogen atom(s) are optionally quaternized. A heteroaryl group can be attached to the remainder of the molecule through a heteroatom. Non-limiting examples of aryl and heteroaryl groups include phenyl, 1-naphthyl, 2-naphthyl, 4-biphenyl, 1-pyrrolyl, 2-pyrrolyl, 3-pyrrolyl, 3-pyrazolyl, 2-imidazolyl, 4-imidazolyl, pyrazinyl, 2-oxazolyl, 4-oxazolyl, 2-phenyl-4-oxazolyl, 5-oxazolyl, 3-isoxazolyl, 4-isoxazolyl, 5-isoxazolyl, 2-thiazolyl, 4-thiazolyl, 5-thiazolyl, 2-furyl, 3-furyl, 2-thienyl, 3-thienyl, 2-pyridyl, 3-pyridyl, 4-pyridyl, 2-pyrimidyl, 4-pyrimidyl, 5-benzothiazolyl, purinyl, 2-benzimidazolyl, 5-indolyl, 1-isoquinolyl, 5-isoquinolyl, 2-quinoxalinyl, 5-quinoxalinyl, 3-quinolyl, and 6-quinolyl. Substituents for each of the above noted aryl and heteroaryl ring systems are selected from the group of acceptable substituents described below.

For brevity, the term “aryl” when used in combination with other terms (e.g., aryloxy, arylthioxy, arylalkyl) includes both aryl and heteroaryl rings as defined above. Thus, the term “arylalkyl” is meant to include those radicals in which an aryl group is attached to an alkyl group (e.g., benzyl, phenethyl, pyridylmethyl and the like) including those alkyl groups in which a carbon atom (e.g., a methylene group) has been replaced by, for example, an oxygen atom (e.g., phenoxymethyl, 2-pyridyloxymethyl, 3-(1-naphthyloxy)propyl, and the like).

Each of the above terms (e.g., “alkyl,” “heteroalkyl,” “aryl” and “heteroaryl”) are meant to include both substituted and unsubstituted forms of the indicated radical. Preferred substituents for each type of radical are provided below.

Substituents for the alkyl and heteroalkyl radicals (including those groups often referred to as alkylene, alkenyl, heteroalkylene, heteroalkenyl, alkynyl, cycloalkyl, heterocycloalkyl, cycloalkenyl, and heterocycloalkenyl) can be a variety of groups selected from: —OR′, ═O, ═NR′, ═N—OR′, —NR′R″, —SR′, -halogen, —SiR′R′″, —OC(O)R′, —C(O)R′, —CO₂R′, —CONR′R″, —OC(O)NR′R″, —NR″C(O)R′, —NR′—C(O)NR″R′″, —NR″C(O)₂R′, —NH—C(NH₂)═NH, —NR′C(NH₂)═NH, —NH—C(NH₂)═NR′, —S(O)R′, —S(O)₂R′, —S(O)₂NR′R″, —CN and —NO₂ in a number ranging from zero to (2 m+1), where m is the total number of carbon atoms in such radical. R′, R″ and R′″ each independently refer to H, unsubstituted (C₁-C₈)alkyl and heteroalkyl, unsubstituted aryl, aryl substituted with 1-3 halogens, alkoxy or thioalkoxy groups, or aryl-(C₁-C₄)alkyl groups. When R′ and R″ are attached to the same nitrogen atom, they can be combined with the nitrogen atom to form a 5-, 6-, or 7-membered ring. For example, —NR′R″ is meant to include 1-pyrrolidinyl and 4-morpholinyl. From the above discussion of substituents, one of skill in the art will understand that the term “alkyl” in its broadest sense is meant to include groups such as haloalkyl (e.g., —CF₃ and —CH₂CF₃) and acyl (e.g., —C(O)CH₃, —C(O)CF₃, —C(O)CH₂OCH₃, and the like). Preferably, the alkyl groups will have from 0-3 substituents, more preferably 0, 1, or 2 substituents, unless otherwise specified.

Similarly, substituents for the aryl and heteroaryl groups are varied and are selected from: -halogen, —OR′, —OC(O)R′, —NR′R″, —SR′, —R′, —CN, —NO₂, —CO₂R′, —CONR′R″, —C(O)R′, —OC(O)NR′R″, —NR″C(O)R′, —NR″C(O)₂R′, —NR′—C(O)NR″R′″, —NH—C(NH₂)═NH, —NR′C(NH₂)═NH, —NH—C(NH₂)═NR′, —S(O)R′, —S(O)₂R′, —S(O)₂NR′R″, —N₃, —CH(Ph)₂, perfluoro(C₁-C₄)alkoxy, and perfluoro(C₁-C₄)alkyl, in a number ranging from zero to the total number of open valences on the aromatic ring system; and where R′, R″ and R′″ are independently selected from H, (C₁-C₈)alkyl and heteroalkyl, unsubstituted aryl and heteroaryl, (unsubstituted aryl)-(C₁-C₄)alkyl, and (unsubstituted aryl)oxy-(C₁-C₄)alkyl.

Two of the substituents on adjacent atoms of the aryl or heteroaryl ring may optionally be replaced with a substituent of the formula -T-C(O)—(CH₂)_(q)—U—, wherein T and U are independently —NH—, —O—, —CH₂ or a single bond, and q is an integer of from 0 to 2. Alternatively, two of the substituents on adjacent atoms of the aryl or heteroaryl ring may optionally be replaced with a substituent of the formula -A-(CH₂)_(r)—B—, wherein A and B are independently —CH₂, —O—, —NH—, —S—, —S(O), —S(O)₂, —S(O)₂NR′ or a single bond, and r is an integer of from 1 to 3. One of the single bonds of the new ring so formed may optionally be replaced with a double bond. Alternatively, two of the substituents on adjacent atoms of the aryl or heteroaryl ring may optionally be replaced with a substituent of the formula —(CH₂), —X—(CH₂)_(t)—, where s and t are independently integers of from 0 to 3, and X is —O—, —NR′—, —S—, —S(O), —S(O)₂—, or —S(O)₂NR′—. The substituent R′ in —NR′ and —S(O)₂NR′— is selected from hydrogen or unsubstituted (C₁-C₆)alkyl.

As used herein, the term “heteroatom” is meant to include oxygen (O), nitrogen (N), sulfur (S) and silicon (Si).

As used herein, the abbreviation “Me” is meant to be methyl or a radical thereof (i.e., —CH₃), the abbreviation “Et” is meant to be ethyl or a radical thereof, and the abbreviation “Ph” is meant to be phenyl or a radical thereof.

The term “pharmaceutically acceptable salts” is meant to include salts of the compounds which are prepared with relatively nontoxic acids or bases, depending on the particular substituents found on the compounds described herein. When compounds of the present invention contain relatively acidic functionalities, base addition salts can be obtained by contacting the neutral form of such compounds with a sufficient amount of the desired base, either neat or in a suitable inert solvent. Examples of pharmaceutically acceptable base addition salts include sodium, potassium, calcium, ammonium, organic amino, or magnesium salt, or a similar salt. When compounds of the present invention contain relatively basic functionalities, acid addition salts can be obtained by contacting the neutral form of such compounds with a sufficient amount of the desired acid, either neat or in a suitable inert solvent. Examples of pharmaceutically acceptable acid addition salts include those derived from inorganic acids like hydrochloric, hydrobromic, nitric, carbonic, monohydrogencarbonic, phosphoric, monohydrogenphosphoric, dihydrogenphosphoric, sulfuric, monohydrogensulfuric, hydriodic, or phosphorous acids and the like, as well as the salts derived from relatively nontoxic organic acids like acetic, propionic, isobutyric, maleic, malonic, benzoic, succinic, suberic, fumaric, mandelic, phthalic, benzenesulfonic, p-tolylsulfonic, citric, tartaric, methanesulfonic, and the like. Also included are salts of amino acids such as arginate and the like, and salts of organic acids like glucuronic or galactunoric acids and the like (see, for example, Berge, et al. (1977) J. Pharm. Sci. 66:1-19). Certain specific compounds of the present invention contain both basic and acidic functionalities that allow the compounds to be converted into either base or acid addition salts.

The neutral forms of the compounds may be regenerated by contacting the salt with a base or acid and isolating the parent compound in the conventional manner. The parent form of the compound differs from the various salt forms in certain physical properties, such as solubility in polar solvents, but otherwise the salts are equivalent to the parent form of the compound for the purposes of the present invention.

In addition to salt forms, the present invention provides compounds which are in a prodrug form. Prodrugs of the active compounds described herein are inactive compounds that readily undergo chemical changes under physiological conditions to provide active compounds of the present invention. Additionally, prodrugs can be converted to active compounds of the present invention by chemical or biochemical methods in an ex vivo environment. For example, prodrugs can be slowly converted to active compounds of the present invention when placed in a transdermal patch reservoir with a suitable enzyme or chemical reagent. Prodrugs are often useful because, in some situations, they may be easier to administer than the active compound. They may, for instance, be bioavailable by oral administration whereas the active compound is not. The prodrug may also have improved solubility in pharmacological compositions over the active compound. A wide variety of prodrug derivatives are known in the art, such as those that rely on hydrolytic cleavage or oxidative activation of the prodrug. An example, without limitation, of a prodrug would be a compound of the present invention which is administered as an ester (the “prodrug”), but then is metabolically hydrolyzed to the carboxylic acid, the active entity. Additional examples include peptidyl derivatives of an active compound of the invention.

Certain compounds of the present invention can exist in unsolvated forms as well as solvated forms, including hydrated forms. In general, the solvated forms are equivalent to unsolvated forms and are intended to be encompassed within the scope of the present invention. Certain compounds of the present invention may exist in multiple crystalline or amorphous forms. In general, all physical forms are equivalent for the uses contemplated by the present invention and are intended to be within the scope of the present invention.

Certain compounds of the present invention possess asymmetric carbon atoms (optical centers) or double bonds; the racemates, enantiomers, diastereomers, geometric isomers and individual isomers are all intended to be encompassed within the scope of the present invention.

As used herein and unless otherwise indicated, the term “stereoisomer” or “stereomerically pure” means one stereoisomer of a compound that is substantially free of other stereoisomers of that compound. For example, a stereomerically pure compound having one chiral center will be substantially free of the opposite enantiomer of the compound. A stereomerically pure a compound having two chiral centers will be substantially free of other diastereomers of the compound. A typical stereomerically pure compound comprises greater than about 80% by weight of one stereoisomer of the compound and less than about 20% by weight of other stereoisomers of the compound, more preferably greater than about 90% by weight of one stereoisomer of the compound and less than about 10% by weight of the other stereoisomers of the compound, even more preferably greater than about 95% by weight of one stereoisomer of the compound and less than about 5% by weight of the other stereoisomers of the compound, and most preferably greater than about 97% by weight of one stereoisomer of the compound and less than about 3% by weight of the other stereoisomers of the compound. It should be noted that if the stereochemistry of a structure or a portion of a structure is not indicated with, for example, bold or dashed lines, the structure or portion of the structure is to be interpreted as encompassing all stereoisomers of it.

Various compounds of the invention contain one or more chiral centers, and can exist as racemic mixtures of enantiomers, mixtures of diastereomers or enantiomerically or optically pure compounds. This invention encompasses the use of stereomerically pure forms of such compounds, as well as the use of mixtures of those forms. For example, mixtures comprising equal or unequal amounts of the enantiomers of a particular compound of the invention may be used in methods and compositions of the invention. These isomers may be asymmetrically synthesized or resolved using standard techniques such as chiral columns or chiral resolving agents. See, e.g., Jacques, J., et al., Enantiomers, Racemates and Resolutions (Wiley-Interscience, New York, 1981); Wilen, S. H., et al., Tetrahedron 33:2725 (1977); Eliel, E. L., Stereochemistry of Carbon Compounds (McGraw-Hill, NY, 1962); and Wilen, S. H., Tables of Resolving Agents and Optical Resolutions p. 268 (E. L. Eliel, Ed., Univ. of Notre Dame Press, Notre Dame, Ind., 1972).

The compounds of the present invention may also contain unnatural proportions of atomic isotopes at one or more of the atoms that constitute such compounds. For example, the compounds may be radiolabeled with radioactive isotopes, such as for example tritium (³H), iodine-125 (¹²⁵I) or carbon-14 (¹⁴C). Radiolabeled compounds are useful as therapeutic agents, e.g., cancer therapeutic agents, research reagents, e.g., binding assay reagents, and diagnostic agents, e.g., in vivo imaging agents. All isotopic variations of the compounds of the present invention, whether radioactive or not, are intended to be encompassed within the scope of the present invention.

As used herein, the term “active” means effective to modulate, e.g., inhibit, CXCR3 function.

The terms “treat”, “treating” or “treatment”, as used herein, refer to a method of alleviating or abrogating a disease and/or its attendant symptoms. The terms “prevent”, “preventing” or “prevention”, as used herein, refer to a method of barring a subject from acquiring a disease.

6.2 Embodiments of the Invention

The present invention is directed to compounds, compositions and methods useful in the modulation of chemokine receptor activity, particularly CXCR3. The compounds of the invention are useful for the treatment of, for example, inflammatory and immunoregulatory disorders, and can be administered directly to subjects, for example, humans, as formulated pharmaceuticals. The compounds of the invention are also useful for identifying and/or designing compounds that modulate CXCR3 function, e.g., CXCR3 antagonists, and compounds that are converted to one or more compounds that modulate CXCR3 function under physiological conditions.

The compounds of the present invention are those which inhibit at least one function or characteristic of a mammalian CXCR3 protein, for example, a human CXCR3 protein. The ability of a compound to inhibit such a function can be demonstrated in a binding assay (e.g., ligand binding or agonist binding), a signaling assay (e.g., activation of a mammalian G protein, induction of rapid and transient increase in the concentration of cytosolic free calcium), and/or cellular response function (e.g., stimulation of chemotaxis, exocytosis or inflammatory mediator release by leukocytes). Exemplary assays are described in the Examples below and in U.S. Patent Application Publication Nos. 2002/0169159 A1, and 2003/0055054 A1, the contents of which are each hereby incorporated by reference in their entirety.

6.3 Compounds

The present invention provides compounds that are useful as antagonists of CXCR3, having particular utility for the treatment or prevention of inflammatory or immune conditions or disorders.

In one aspect, the present invention provides a compound having the formula (I):

where A¹, A², A³, A⁴, R¹, R², R³, R⁴, Q and L are defined below. The compound provided in the above formula includes pharmaceutically acceptable salts, solvates or prodrugs thereof, unless otherwise indicated.

Q is a member selected from the group consisting of a —C(O)—, —CH₂CO—, —CH₂SO— and —CH₂SO₂—.

In certain embodiments, Q is —C(O)— or —CH₂—.

In some embodiments, Q is —C(O)—.

L is a bond or (C₁-C₅)alkylene.

In some embodiments, L is —CH₂— or —CH₂CH₂—.

A¹, A² and A³ are independently selected from the group consisting of C(R′)(R″) and C(O).

A⁴ is C(R′)(R″) or N(R′″).

In some embodiments, wherein A⁴ is N(R′″).

In other embodiments, A⁴ is C(R′)(R″)

In certain embodiments, A¹, A² and A³ are C(R′)(R″).

Each R′ and R″ is independently selected from the group consisting of hydrogen, halogen, (C₁-C₈)alkyl, (C₂-C₈)heteroalkyl, fluoro(C₁-C₄)alkyl, aryl, heteroaryl, aryl(C₁-C₈)alkyl and heteroaryl(C₁-C₈)alkyl, optionally, R′ and R″ groups on adjacent carbon atoms may be combined to form a 5- or 6-membered fused ring, and R′ and R″ groups attached to the same carbon atom may be combined to form a 3-8 membered spirocyclic ring.

R′″ is selected from the group consisting of hydrogen, (C₁-C₈)alkyl and (C₂-C₈)heteroalkyl.

R¹ is heteroaryl or aryl.

In some embodiments, R¹ is a unsubstituted or a meta- or para-substituted phenyl, wherein the substituting group is a halogen, cyano, (C₁-C₈)alkyl, (C₁-C₈)haloalkyl, oxy(C₁-C₈)alkyl, or oxy(C₁-C₈)haloalkyl.

In certain embodiments, R¹ is para-cyanophenyl.

R² is selected from the group consisting of hydrogen, halogen, (C₁-C₁₀)alkyl, (C₂-C₁₀)heteroalkyl, hetero(C₁-C₁₀)cycloalkyl, (C₁-C₁₀)alkylaryl and (C₂-C₁₀)heteroalkylaryl, optionally R² may be combined with L to form a 5-, 6-, 7- or 8-membered ring containing from 1 to 3 heteroatoms selected from the group consisting of N, O and S.

In certain embodiments, R² is a member selected from the group consisting of

R³ is absent or is a member selected from the group consisting of —H, —CHR⁶R⁷, S(O)_(m)R⁵, —S(O)_(m)N(R⁸)R⁹, —S(O)_(m)N(R⁸)CH₂R⁶, —N(R⁸)SO₂R⁵, —N(R⁸)CH₂R¹⁰,

Optionally, R³ may be combined with R² to form a 4-, 5-, 6-, 7- or 8-membered ring containing from 1 to 3 heteroatoms selected from the group consisting of N, O and S.

In some embodiments, R³ is a member selected from the group consisting of

In some embodiments, -L-R³ when taken together is

R⁵ is selected from the group consisting of (C₁-C₈)alkyl, (C₂-C₈)heteroalkyl, aryl and heteroaryl.

R⁶ and R⁷ independently are hydrogen, (C₁-C₈)alkyl or (C₂-C₈)heteroalkyl.

R⁸ is hydrogen, (C₁-C₈)alkyl, (C₂-C₈)heteroalkyl, heteroaryl or aryl.

R⁹ is (C₁-C₈)alkyl.

R¹⁰ is aryl.

Z is CH or N.

X is a bond, (C₁-C₆)alkylene or (C₁-C₆)heteroalkylene.

Y is (C₁-C₆)alkylene.

The subscript m is 0, 1 or 2.

R⁴ is a member selected from the group consisting of (C₁-C₂₀)alkyl, (C₂-C₂₀)heteroalkyl, heteroaryl, aryl, heteroaryl(C₁-C₆)alkyl, heteroaryl(C₂-C₆)heteroalkyl, aryl(C₁-C₆)alkyl and aryl(C₂-C₆)heteroalkyl.

In some embodiments, -Q-R⁴ is

In certain embodiments of formula I, A⁴ is not NH when A¹, A² and A³ are CH₂, R¹ is 4-(2,2,2-trifluoroethoxy)phenyl, R² is methyl, R³ is 3-picolyl and Q is C(O), -Q-R⁴ taken together is

and L is —CH₂—.

In a certain embodiments, the present invention provides a compound having the formula (II):

wherein R¹, R², R³, R⁴, R′″, Q and L are defined as above, and each R^(a) is independently selected from the group consisting of halogen, (C₁-C₈)alkyl, (C₂-C₈)heteroalkyl, fluoro(C₁-C₄)alkyl, aryl, heteroaryl, aryl(C₁-C₈)alkyl and heteroaryl(C₁-C₈)alkyl, optionally, R^(a) groups on adjacent carbon atoms may be combined to form a 5- or 6-membered fused ring, and R^(a) groups attached to the same carbon atom may be combined to form a 3-8 membered spirocyclic ring; and the subscript k is 0, 1, 2, 3 or 4.

In some embodiments, R′″ is —CH₃, —CH₂CH₃ or —C(O)CH₃.

In some embodiments, k is 0.

In certain embodiments, the compound has the formula (III):

wherein R², R³, R⁴, R′″, Q and L are defined as above, and R¹¹ is selected from the group consisting of hydrogen, (C₁-C₈)alkyl and (C₂-C₈)heteroalkyl.

In a group of embodiments of formula I, the compound has the formula (IV):

where R¹, R², R³, R⁴, R′, R″, Q and L are defined as above.

In some embodiments, R′ and R″ are both hydrogen or both alkyl.

In some embodiments, R′ and R″ are both hydrogen or both methyl.

In some embodiments, R′ and R″ are independently hydrogen or methyl.

In a group of embodiments of formula I, the compound has the formula (V):

where R¹, R², R³, R⁴, Q and L are defined as above, and each R^(a) is independently selected from the group consisting of halogen, (C₁-C₈)alkyl, (C₂-C₈)heteroalkyl, fluoro(C₁-C₄)alkyl, aryl, heteroaryl, aryl(C₁-C₈)alkyl and heteroaryl(C₁-C₈)alkyl, or optionally, R^(a) groups on adjacent carbon atoms may be combined to form a 5- or 6-membered fused ring, and R^(a) groups attached to the same carbon atom may be combined to form a 3-8 membered spirocyclic ring, and the subscript p is 0, 1, 2, 3 or 4.

In some embodiments, the compound has the formula (VI):

where R², R³, R⁴, R^(a), subscript p, Q and L are defined as above, and R¹¹ is selected from the group consisting of hydrogen, (C₁-C₈)alkyl and (C₂-C₈)heteroalkyl.

It is readily appreciated that the compounds provided herein exist in stereoisomers. In certain embodiments, a compound of the above formulas are a racemic compound. In other embodiments, the compound of formula (I), (II), (III), (IV), (V) or (VI) comprises a mixture of (S) and (R) enantiomers.

In certain embodiments, a compound is an enantiomer. In certain embodiments, the present invention provides compounds having the formula (Ia):

where A1, A2, A³, A⁴, R¹, R², R³, R⁴, Q and L are as defined in formula I above.

In other embodiments, the compound has the formula (Ib):

where A¹, A², A³, A⁴, R¹, R², R³, R⁴, Q and L are as defined in formula I above.

In certain other embodiments, the present invention provides a racemic mixture of compounds Ia and Ib.

In certain embodiments, the present invention provides compounds having the formula (IIa):

where R¹, R², R³, R⁴, R′″, Q, L, R^(a) and subscript k are as defined in formula II above.

In other embodiments, the compound has the formula (IIb):

where R¹, R², R³, R⁴, R′″, Q, L, R^(a) and subscript k are as defined in formula II above.

In certain other embodiments, the present invention provides a racemic mixture of compounds IIa and IIb.

In certain embodiments, the present invention provides compounds having the formula (IIIa):

where R², R³, R⁴, R′″, Q, L and R¹¹ are as defined in formula III above.

In other embodiments, the compound has the formula (IIIb):

where R², R³, R⁴, R′″, Q, L and R¹¹ are as defined in formula III above.

In certain other embodiments, the present invention provides a racemic mixture of compounds IIIa and IIIb.

In certain embodiments, the present invention provides compounds having the formula (IVa):

where R², R², R³, R⁴, R′, R″, Q and L are defined as above in formula IV.

In other embodiments, the compound has the formula (IVb):

where R², R², R³, R⁴, R′, R″, Q and L are defined as in formula IV above.

In certain other embodiments, the present invention provides a racemic mixture of compounds IVa and IVb.

In certain embodiments, the present invention provides compounds having the formula (Va):

where R¹, R², R³, R⁴, R^(a), subscript p, Q and L are defined as in formula V above.

In other embodiments, the compound has the formula (Vb):

where R¹, R², R³, R⁴, R^(a), subscript p, Q and L are defined as in formula V above.

In certain other embodiments, the present invention provides a racemic mixture of compounds Va and Vb.

In certain embodiments, a compound of the present invention is in a solid form. For example, in some embodiments, a compound of the present invention is in a crystalline form. In some embodiments, the compound is in an amorphous form.

In certain embodiments, a compound of the present invention is in a crystalline form with a purity of at least 80%, at least 90%, at least 92%, at least 95%, at least 97%, or at least 98%.

6.4 Preparation of the Compounds

The Examples in Section 7, and FIGS. 1-9 provide a variety of synthesis routes to the compounds provided herein. Synthesis of appropriate starting materials can be prepared by techniques known or apparent to those of skill in the art or the starting materials may be commercially available. For instance, such materials can be prepared according to the methods of U.S. Patent Applications Nos. 2002/0160159 A1 and 2003/0055054 A1 and International Publication No. WO 02/83143, the contents of which are each hereby incorporated herein by reference in its entirety. One of skill in the art will appreciate that the substituents can be added or altered before, during or after preparation of the heterocyclic scaffolding and that suitable adjustments in conditions (e.g., temperatures, solvents, etc.) can be made. Additionally, one of skill in the art will recognize that protecting groups may be necessary for the preparation of certain compounds and will be aware of those conditions compatible with a selected protecting group.

The exemplary methods and the examples described herein are illustrative of the present invention and are not to be construed as limiting the scope thereof.

6.5 Compositions

In another aspect, the present invention provides pharmaceutical compositions for modulating chemokine receptor activity in humans and animals. The compositions comprise a compound of the present invention with a pharmaceutically acceptable carrier or diluent.

“Modulation” or modulating of chemokine receptor activity, as used herein in its various forms, is intended to encompass antagonism, agonism, partial antagonism and/or partial agonism of the activity associated with a particular chemokine receptor, preferably the CXCR3 receptor. The term “composition” as used herein is intended to encompass a product comprising the specified ingredients (and in the specified amounts, if indicated), as well as any product which results, directly or indirectly, from combination of the specified ingredients in the specified amounts. By “pharmaceutically acceptable” it is meant the carrier, diluent or excipient must be compatible with the other ingredients of the formulation and not deleterious to the recipient thereof.

The pharmaceutical compositions for the administration of the compounds of this invention may conveniently be presented in unit dosage form and may be prepared by any of the methods well known in the art of pharmacy. All methods include the step of bringing the active ingredient into association with the carrier which constitutes one or more accessory ingredients. In general, the pharmaceutical compositions are prepared by uniformly and intimately bringing the active ingredient into association with a liquid carrier or a finely divided solid carrier or both, and then, if necessary, shaping the product into the desired formulation. In the pharmaceutical composition the compound is included in an amount sufficient to produce the desired effect upon the process or condition of diseases.

The pharmaceutical compositions containing the active ingredient may be in a form suitable for oral use, for example, as tablets, troches, lozenges, aqueous or oily suspensions, dispersible powders or granules, emulsions, hard or soft capsules, or syrups or elixirs. Compositions intended for oral use may be prepared according to any method known to the art for the manufacture of pharmaceutical compositions and such compositions may contain one or more agents selected from the group consisting of sweetening agents, flavoring agents, coloring agents and preserving agents in order to provide pharmaceutically elegant and palatable preparations. Tablets contain the active ingredient in admixture with non-toxic pharmaceutically acceptable excipients which are suitable for the manufacture of tablets. These excipients may be, for example, inert diluents, such as calcium carbonate, sodium carbonate, lactose, calcium phosphate or sodium phosphate; granulating and disintegrating agents, for example, corn starch, or alginic acid; binding agents, for example starch, gelatin or acacia, and lubricating agents, for example magnesium stearate, stearic acid or talc. The tablets may be uncoated or they may be coated by known techniques to delay disintegration and absorption in the gastrointestinal tract and thereby provide a sustained action over a longer period. For example, a time delay material such as glyceryl monostearate or glyceryl distearate may be employed. They may also be coated by the techniques described in U.S. Pat. Nos. 4,256,108; 4,166,452 and 4,265,874 to form osmotic therapeutic tablets for control release.

Formulations for oral use may also be presented as hard gelatin capsules wherein the active ingredient is mixed with an inert solid diluent, for example, calcium carbonate, calcium phosphate or kaolin, or as soft gelatin capsules wherein the active ingredient is mixed with water or an oil medium, for example peanut oil, liquid paraffin, or olive oil.

Aqueous suspensions contain the active materials in admixture with excipients suitable for the manufacture of aqueous suspensions. Such excipients are suspending agents, for example sodium carboxymethylcellulose, methylcellulose, hydroxy-propylmethylcellulose, sodium alginate, polyvinyl-pyrrolidone, gum tragacanth and gum acacia; dispersing or wetting agents may be a naturally-occurring phosphatide, for example lecithin, or condensation products of an alkylene oxide with fatty acids, for example polyoxy-ethylene stearate, or condensation products of ethylene oxide with long chain aliphatic alcohols, for example heptadecaethyleneoxycetanol, or condensation products of ethylene oxide with partial esters derived from fatty acids and a hexitol such as polyoxyethylene sorbitol monooleate, or condensation products of ethylene oxide with partial esters derived from fatty acids and hexitol anhydrides, for example polyethylene sorbitan monooleate. The aqueous suspensions may also contain one or more preservatives, for example ethyl, or n-propyl, p-hydroxybenzoate, one or more coloring agents, one or more flavoring agents, and one or more sweetening agents, such as sucrose or saccharin.

Oily suspensions may be formulated by suspending the active ingredient in a vegetable oil, for example arachis oil, olive oil, sesame oil or coconut oil, or in a mineral oil such as liquid paraffin. The oily suspensions may contain a thickening agent, for example beeswax, hard paraffin or cetyl alcohol. Sweetening agents such as those set forth above, and flavoring agents may be added to provide a palatable oral preparation. These compositions may be preserved by the addition of an anti-oxidant such as ascorbic acid.

Dispersible powders and granules suitable for preparation of an aqueous suspension by the addition of water provide the active ingredient in admixture with a dispersing or wetting agent, suspending agent and one or more preservatives. Suitable dispersing or wetting agents and suspending agents are exemplified by those already mentioned above. Additional excipients, for example sweetening, flavoring and coloring agents, may also be present.

The pharmaceutical compositions of the invention may also be in the form of oil-in-water emulsions. The oily phase may be a vegetable oil, for example olive oil or arachis oil, or a mineral oil, for example liquid paraffin or mixtures of these. Suitable emulsifying agents may be naturally-occurring gums, for example gum acacia or gum tragacanth, naturally-occurring phosphatides, for example soy bean, lecithin, and esters or partial esters derived from fatty acids and hexitol anhydrides, for example sorbitan monooleate, and condensation products of the said partial esters with ethylene oxide, for example polyoxyethylene sorbitan monooleate. The emulsions may also contain sweetening and flavoring agents.

Syrups and elixirs may be formulated with sweetening agents, for example glycerol, propylene glycol, sorbitol or sucrose. Such formulations may also contain a demulcent, a preservative and flavoring and coloring agents.

The pharmaceutical compositions may be in the form of a sterile injectable aqueous or oleagenous suspension. This suspension may be formulated according to the known art using those suitable dispersing or wetting agents and suspending agents which have been mentioned above. The sterile injectable preparation may also be a sterile injectable solution or suspension in a non-toxic parenterally-acceptable diluent or solvent, for example as a solution in 1,3-butane diol. Among the acceptable vehicles and solvents that may be employed are water, Ringer's solution and isotonic sodium chloride solution. In addition, sterile, fixed oils are conventionally employed as a solvent or suspending medium. For this purpose any bland fixed oil may be employed including synthetic mono- or diglycerides. In addition, fatty acids such as oleic acid find use in the preparation of injectables.

The compounds of the present invention may also be administered in the form of suppositories for rectal administration of the drug. These compositions can be prepared by mixing the drug with a suitable non-irritating excipient which is solid at ordinary temperatures but liquid at the rectal temperature and will therefore melt in the rectum to release the drug. Such materials include, but are not limited to, cocoa butter and polyethylene glycols.

For topical use, creams, ointments, jellies, solutions or suspensions, etc., containing the compounds of the present invention are employed. As used herein, topical application is also meant to include the use of mouth washes and gargles.

The pharmaceutical composition and method of the present invention may further comprise other therapeutically effective compounds as noted herein which are usually applied in the treatment or prevention of the above mentioned pathological conditions.

6.6 Methods of Use

In yet another aspect, the present invention provides methods of treating CXCR3-mediated conditions or diseases by administering to a subject having such a disease or condition, a therapeutically effective amount of compound or composition of the invention. The “subject” is defined herein to include animals such as mammals, including, but not limited to, primates (e.g., humans), cows, sheep, goats, horses, pigs, dogs, cats, rabbits, rats, mice and the like.

As used herein, the phrase “CXCR3-mediated condition or disease” and related phrases and terms refer to a condition characterized by inappropriate, e.g., less than or greater than normal, CXCR3 activity. Inappropriate CXCR3 activity might arise as the result of CXCR3 expression in cells which normally do not express CXCR3, increased CXCR3 expression (leading to, e.g., inflammatory and immunoregulatory disorders and diseases), or, decreased CXCR3 expression (leading to, e.g., certain cancers and angiogenic and vasculogenic-related disorders). Inappropriate CXCR3 functional activity might arise as the result of CXCR3 expression in cells which normally do not express CXCR3, increased CXCR3 expression (leading to, e.g., inflammatory and immunoregulatory disorders and diseases) or decreased CXCR3 expression. Inappropriate CXCR3 functional activity might also arise as the result of chemokine secretion by cells which normally do not secrete a CXC chemokine, increased chemokine expression (leading to, e.g., inflammatory and immunoregulatory disorders and diseases) or decreased chemokine expression. A CXCR3-mediated condition or disease may be completely or partially mediated by inappropriate CXCR3 functional activity. However, a CXCR3-mediated condition or disease is one in which modulation of CXCR3 results in some effect on the underlying condition or disease (e.g., a CXCR3 antagonist results in some improvement in patient well-being in at least some patients).

The term “therapeutically effective amount” means the amount of the subject compound that will elicit the biological or medical response of a tissue, system, animal or human that is being sought by the researcher, veterinarian, medical doctor or other clinician or that is sufficient to prevent development of or alleviate to some extent one or more of the symptoms of the disease being treated.

Diseases and conditions associated with inflammation, infection and cancer can be treated with the present compounds and compositions. In one group of embodiments, diseases or conditions, including chronic diseases, of humans or other species can be treated with inhibitors of CXCR3 function. These diseases or conditions include: (1) inflammatory or allergic diseases such as systemic anaphylaxis or hypersensitivity responses, drug allergies, insect sting allergies and food allergies; inflammatory bowel diseases, such as Crohn's disease, ulcerative colitis, ileitis and enteritis; vaginitis; psoriasis and inflammatory dermatoses such as dermatitis, eczema, atopic dermatitis, allergic contact dermatitis, urticaria; vasculitis; spondyloarthropathies; scleroderma; asthma and respiratory allergic diseases such as allergic rhinitis, hypersensitivity lung diseases, and the like, (2) autoimmune diseases, such as arthritis (rheumatoid and psoriatic), multiple sclerosis, systemic lupus erythematosus, type I diabetes, glomerulonephritis, and the like, (3) graft rejection (including allograft rejection and graft-v-host disease) and conditions associated therewith, and (4) other diseases in which undesired inflammatory responses are to be inhibited, e.g., atherosclerosis, myositis, neurodegenerative diseases (e.g., Alzheimer's disease), encephalitis, meningitis, hepatitis, nephritis, sepsis, sarcoidosis, conjunctivitis, otitis, chronic obstructive pulmonary disease, sinusitis and Behcet's syndrome. In another group of embodiments, diseases or conditions are treated with agonists of CXCR3 function. Examples of diseases to be treated with CXCR3 agonists include cancers, diseases in which angiogenesis or neovascularization play a role (neoplastic diseases, retinopathy and macular degeneration), infectious diseases and immunosuppressive diseases.

Preferably, the present methods are directed to the treatment or prevention of diseases or conditions selected from neurodegenerative diseases (e.g., Alzheimer's disease), multiple sclerosis, systemic lupus erythematosus, rheumatoid arthritis, atherosclerosis, encephalitis, meningitis, hepatitis, nephritis, sepsis, sarcoidosis, psoriasis, eczema, uticaria, type I diabetes, asthma, conjunctivitis, otitis, allergic rhinitis, chronic obstructive pulmonary disease, sinusitis, dermatitis, inflammatory bowel disease, ulcerative colitis, Crohn's disease, Behcet's syndrome, gout, cancer, viral infections (e.g., HIV), bacterial infections, and organ transplant conditions or skin transplant conditions. The term “organ transplant conditions” is meant to include bone marrow transplant conditions and solid organ (e.g., kidney, liver, lung, heart, pancreas or combination thereof) transplant conditions.

Diseases or conditions that can be treated with the present compounds and compositions include diseases commonly associated with (1) inflammatory or allergic diseases, (2) autoimmune diseases, (3) graft rejection and (4) other diseases in which undesired inflammatory responses are to be inhibited, as described above. For example, restenosis following a procedure such as balloon angioplasty, is commonly associated with atherosclerosis and can be treated with the present compounds and compositions.

Depending on the disease to be treated and the subject's condition, the compounds of the present invention may be administered by oral, parenteral (e.g., intramuscular, intraperitoneal, intravenous, ICV, intracisternal injection or infusion, subcutaneous injection, or implant), inhalation spray, nasal, vaginal, rectal, sublingual, or topical routes of administration and may be formulated, alone or together, in suitable dosage unit formulations containing conventional non-toxic pharmaceutically acceptable carriers, adjuvants and vehicles appropriate for each route of administration.

In the treatment or prevention of conditions which require chemokine receptor modulation an appropriate dosage level will generally be about 0.001 to 100 mg per kg patient body weight per day which can be administered in single or multiple doses. Preferably, the dosage level will be about 0.01 to about 25 mg/kg per day; more preferably about 0.05 to about 10 mg/kg per day. A suitable dosage level may be about 0.01 to 25 mg/kg per day, about 0.05 to 10 mg/kg per day, or about 0.1 to 5 mg/kg per day. Within this range the dosage may be 0.005 to 0.05, 0.05 to 0.5 or 0.5 to 5.0 mg/kg per day. For oral administration, the compositions are preferably provided in the form of tablets containing 1.0 to 1000 milligrams of the active ingredient, particularly 1.0, 5.0, 10.0, 15.0, 20.0, 25.0, 50.0, 75.0, 100.0, 150.0, 200.0, 250.0, 300.0, 400.0, 500.0, 600.0, 750.0, 800.0, 900.0, and 1000.0 milligrams of the active ingredient for the symptomatic adjustment of the dosage to the patient to be treated. The compounds may be administered on a regimen of 1 to 4 times per day, preferably once or twice per day.

It will be understood, however, that the specific dose level and frequency of dosage for any particular patient may be varied and will depend upon a variety of factors including the activity of the specific compound employed, the metabolic stability and length of action of that compound, the age, body weight, general health, sex, diet, mode and time of administration, rate of excretion, drug combination, the severity of the particular condition, and the host undergoing therapy.

The compounds of the present invention can be combined with other compounds having related utilities to treat or prevent inflammatory and immune disorders and diseases, including asthma and allergic diseases, as well as autoimmune pathologies such as rheumatoid arthritis and atherosclerosis, and those pathologies noted above. In many instances, compositions which include a compound of the invention and an alternative or second therapeutic agent have additive or synergistic effects when administered.

For example, in the treatment or prevention of inflammation, the present compounds may be used in conjunction or combination with an anti-inflammatory or analgesic agent such as an opiate agonist, a lipoxygenase inhibitor, such as an inhibitor of 5-lipoxygenase, a cyclooxygenase inhibitor, such as a cyclooxygenase-2 inhibitor, an interleukin inhibitor, such as an interleukin-1 inhibitor, an NMDA antagonist, an inhibitor of nitric oxide or an inhibitor of the synthesis of nitric oxide, a non-steroidal anti-inflammatory agent, or a cytokine-suppressing anti-inflammatory agent, for example with a compound such as acetaminophen, aspirin, codeine, fentanyl, ibuprofen, indomethacin, ketorolac, morphine, naproxen, phenacetin, piroxicam, a steroidal analgesic, sufentanyl, sunlindac, tenidap, and the like. Similarly, the instant compounds may be administered with a pain reliever; a potentiator such as caffeine, an H2-antagonist, simethicone, aluminum or magnesium hydroxide; a decongestant such as phenylephrine, phenylpropanolamine, pseudophedrine, oxymetazoline, ephinephrine, naphazoline, xylometazoline, propylhexedrine, or levo-desoxy-ephedrine; an antiitussive such as codeine, hydrocodone, caramiphen, carbetapentane, or dextromethorphan; a diuretic; and a sedating or non-sedating antihistamine. Likewise, compounds of the present invention may be used in combination with other drugs that are used in the treatment/prevention/suppression or amelioration of the diseases or conditions for which compounds of the present invention are useful. Such other drugs may be administered, by a route and in an amount commonly used therefor, contemporaneously or sequentially with a compound of the present invention. When a compound of the present invention is used contemporaneously with one or more other drugs, a pharmaceutical composition containing such other drugs in addition to the compound of the present invention is preferred. Accordingly, the pharmaceutical compositions of the present invention include those that also contain one or more other active ingredients, in addition to a compound of the present invention. Examples of other active ingredients that may be combined with a compound of the present invention, either administered separately or in the same pharmaceutical compositions, include, but are not limited to: (a) VLA-4 antagonists, (b) steroids such as beclomethasone, methylprednisolone, betamethasone, prednisone, dexamethasone, and hydrocortisone; (c) immunosuppressants such as cyclosporine (cyclosporine A, Sandimmune®, Neoral®), tacrolimus (FK-506, Prograf®), rapamycin (sirolimus, Rapamune®) and other FK-506 type immunosuppressants, and mycophenolate, e.g., mycophenolate mofetil (CellCept®); (d) antihistamines (H1-histamine antagonists) such as bromopheniramine, chlorpheniramine, dexchlorpheniramine, triprolidine, clemastine, diphenhydramine, diphenylpyraline, tripelennamine, hydroxyzine, methdilazine, promethazine, trimeprazine, azatadine, cyproheptadine, antazoline, pheniramine pyrilamine, astemizole, terfenadine, loratadine, cetirizine, fexofenadine, descarboethoxyloratadine, and the like; (e) non-steroidal anti-asthmatics such as β2-agonists (terbutaline, metaproterenol, fenoterol, isoetharine, albuterol, bitolterol, and pirbuterol), theophylline, cromolyn sodium, atropine, ipratropium bromide, leukotriene antagonists (zafirlukast, montelukast, pranlukast, iralukast, pobilukast, SKB-106,203), leukotriene biosynthesis inhibitors (zileuton, BAY-1005); (f) non-steroidal anti-inflammatory agents (NSAIDs) such as propionic acid derivatives (alminoprofen, benoxaprofen, bucloxic acid, carprofen, fenbufen, fenoprofen, fluprofen, flurbiprofen, ibuprofen, indoprofen, ketoprofen, miroprofen, naproxen, oxaprozin, pirprofen, pranoprofen, suprofen, tiaprofenic acid, and tioxaprofen), acetic acid derivatives (indomethacin, acemetacin, alclofenac, clidanac, diclofenac, fenclofenac, fenclozic acid, fentiazac, furofenac, ibufenac, isoxepac, oxpinac, sulindac, tiopinac, tolmetin, zidometacin, and zomepirac), fenamic acid derivatives (flufenamic acid, meclofenamic acid, mefenamic acid, niflumic acid and tolfenamic acid), biphenylcarboxylic acid derivatives (diflunisal and flufenisal), oxicams (isoxicam, piroxicam, sudoxicam and tenoxican), salicylates (acetyl salicylic acid, sulfasalazine) and the pyrazolones (apazone, bezpiperylon, feprazone, mofebutazone, oxyphenbutazone, phenylbutazone); (g) cyclooxygenase-2 (COX-2) inhibitors such as celecoxib (Celebrex®) and rofecoxib (Vioxx®); (h) inhibitors of phosphodiesterase type IV (PDE-IV); (i) gold compounds such as auranofin and aurothioglucose, (j) inhibitors of phosphodiesterase type W (PDE-IV); (k) other antagonists of the chemokine receptors, especially CCR1, CCR2, CCR3, CCR5, CCR6, CCR8 and CCR10; (1) cholesterol lowering agents such as HMG-CoA reductase inhibitors (lovastatin, simvastatin and pravastatin, fluvastatin, atorvastatin, and other statins), sequestrants (cholestyramine and colestipol), nicotinic acid, fenofibric acid derivatives (gemfibrozil, clofibrat, fenofibrate and benzafibrate), and probucol; (m) anti-diabetic agents such as insulin, sulfonylureas, biguamides (metformin), α-glucosidase inhibitors (acarbose) and glitazones (troglitazone and pioglitazone); (n) preparations of interferon beta (interferon β-1α, interferon β-1β); (O) etanercept (Enbrel®), (p) antibody therapies such as orthoclone (OKT3), daclizumab (Zenapax®), infliximab (Remicade®), basiliximab (Simulect®) and anti-CD40 ligand antibodies (e.g., MRP-1); and (q) other compounds such as 5-aminosalicylic acid and prodrugs thereof, hydroxychloroquine, D-penicillamine, antimetabolites such as azathioprene and 6-mercaptopurine, and cytotoxic cancer chemotherapeutic agents. The weight ratio of the compound of the present invention to the second active ingredient may be varied and will depend upon the effective dose of each ingredient. Generally, an effective dose of each will be used. Thus, for example, when a compound of the present invention is combined with an NSAID the weight ratio of the compound of the present invention to the NSAID will generally range from about 1000:1 to about 1:1000, preferably about 200:1 to about 1:200. Combinations of a compound of the present invention and other active ingredients will generally also be within the aforementioned range, but in each case, an effective dose of each active ingredient should be used.

Immunosuppressants within the scope of the present invention further include, but are not limited to, leflunomide, RAD001, ERL080, FTY720, CTLA-4, antibody therapies such as orthoclone (OKT3), daclizumab (Zenapax®) and basiliximab (Simulect®), and antithymocyte globulins such as thymoglobulins.

In particularly preferred embodiments, the present methods are directed to the treatment or prevention of multiple sclerosis using a compound of the invention either alone or in combination with a second therapeutic agent selected from betaseron, avonex, azathioprene (Imurek®, Imuran®), capoxone, prednisolone and cyclophosphamide. When used in combination, the practitioner can administer a combination of the therapeutic agents, or administration can be sequential.

In still other particularly preferred embodiments, the present methods are directed to the treatment or prevention of rheumatoid arthritis, wherein the compound of the invention is administered either alone or in combination with a second therapeutic agent selected from the group consisting of methotrexate, sulfasalazine, hydroxychloroquine, cyclosporine A, D-penicillamine, infliximab (Remicade®), etanercept (Enbrel®), auranofin and aurothioglucose.

In yet other particularly preferred embodiments, the present methods are directed to the treatment or prevention of an organ transplant condition wherein the compound of the invention is used alone or in combination with a second therapeutic agent selected from the group consisting of cyclosporine A, FK-506, rapamycin, mycophenolate, prednisolone, azathioprene, cyclophosphamide and an antilymphocyte globulin.

7. EXAMPLES

Reagents and solvents used below can be obtained from commercial sources such as Aldrich Chemical Co. (Milwaukee, Wis., USA). ¹H-NMR spectra were recorded on a Bruker 500 MHZ NMR spectrometer. Significant peaks are tabulated in the order number of protons, multiplicity (s, singlet; d, doublet; t, triplet; q, quartet; m, multiplet; br s, broad singlet) and coupling constant(s) in Hertz (Hz). Electrospray ionization (ESI) mass spectrometry analysis was conducted on a Hewlett-Packard 1100 MSD electrospray mass spectrometer using the HP1 100 HPLC for sample delivery. Mass spectrometry results are reported as the ratio of mass over charge. Each compound was dissolved in methanol at 0.1 mg/mL and 1 microliter was infused with the delivery solvent into the mass spectrometer, which scanned from 100 to 1500 daltons. Each compound could be analyzed in the positive ESI mode, using 1: acetonitrile/water with 1% acetic acid as the delivery solvent. Each compound could also be analyzed in the negative ESI mode, using 2 mM NH₄OAc in acetonitrile/water as delivery solvent.

TABLE 1 Examples 1-8

Ex- am- ple X Y R¹ R² 1 —NH— —CH₂— —OCH₂CF₃

2 —NH— —CH₂— —OCH₂CF₃

3 —NAc— —CH₂— —OEt

4 —NH— —CH₂— —OEt

5 —NH— —CH₂— —OEt

6 —NMe— —CH₂— —OEt

7 —CH₂— —CH₂ —OEt

8 —CH₂— —CMe₂— —OEt

7.1 Example 1

The compound A1 was synthesized as outlined in International Publication No. WO 02/83143, Scheme 9, page 91, substituting 4-(2,2,2-trifluoroethoxy)aniline for p-phenetidine in step 3. Compound A3 was synthesized from A1 in two steps as shown in Scheme A.

(R)-2-[1-(2-Ethanesulfonyl-ethylamino)-ethyl]-3-[4-(2,2,2-trifluoro-ethoxy)-phenyl]-3H-pyrido[2,3-d]pyrimidin-4-one (A2). A mixture of 2.18 g A1 (5.98 mmol, 1.00 equiv.) and 687 μL ethyl vinyl sulfone (6.58 mmol, 1.10 equiv.) in 10 mL methanol was stirred overnight in a 50° C. oil bath then concentrated in vacuo. The product A2 was used without further purification in the next step. MS(ESI⁺) m/z=485.1 [M+H]⁺.

(R)—N-(2-Ethanesulfonyl-ethyl)-2-(4-fluoro-3-trifluoromethyl-phenyl)-N-(1-{4-oxo-3-[4-(2,2,2-trifluoro-ethoxy)-phenyl]-3,4-dihydro-pyrido[2,3-d]pyrimidin-2-yl}-ethyl)-acetamide (A3). The acid chloride (4-fluoro-3-trifluoromethyl-phenyl)acetyl chloride was prepared by addition of several drops of DMF to an ice-cold solution of 2.06 g (4-fluoro-3-trifluoromethyl-phenyl)acetic acid (9.27 mmol, 1.70 equiv.) and 0.81 mL oxalyl chloride (9.27 mmol, 1.70 equiv.) dissolved in 15 mL dichloromethane. Gas evolution ensued and the reaction was equilibrated to room temperature and stirred for 2 h until gas evolution ceased. This solution was added dropwise over 15 min. to a solution of 2.6 g A2 (5.37 mmol, 1.00 equiv.) and 2.24 mL triethylamine (16.1 mmol, 3.00 equiv.) dissolved in 20 mL dichloromethane cooled by an acetone-dry ice bath. The resulting mixture was stirred at low temperature for 20 min. then poured into saturated aqueous sodium bicarbonate. The organic separation was washed with brine, dried over magnesium sulfate, filtered, and concentrated in vacuo to afford a glassy solid. The product was purified by chromatography on silica gel, eluting with a gradient of 50% ethyl acetate in hexane to 100% ethyl acetate. The chromatographed product was then recrystallized from methyl tert-butyl ether to afford A3 as colorless crystals, m.p.=157-159° C. ¹H NMR (400 MHz; CDCl₃; T=300 K) {mixture of S-cis:S-trans amide rotamers in ca. 2.3:1 ratio} δ1.20 (t, J=7.6 Hz, 3H), 1.46 (t, J=7.2 Hz, 6.5H), 1.46 (d, J=7.2 Hz, 6.5H), 2.48 (d, J=16 Hz, 1H), 2.92 (ddd, J=2.8, 7.6, 16.0 Hz, 2H), 2.94 (d, J=16 Hz, 1H), 3.13 (ddd, J=3.6, 7.2, 14.8 Hz, 4.6H), 3.22 (dd, J=6.8, 6.8 Hz, 2H), 3.50 (ddd, J=5.2, 10.6, 13.3 Hz, 2.3H), 3.67 (ddd, J=8.0, 8.0, 13.3 Hz, 1H), 3.84 (s, 4.6H), 3.90 (ddd, J=4.8, 10, 14.8 Hz, 2.3H), 4.02 (ddd, J=8.0, 8.0, 13.3 Hz, 1H), 4.06-4.27 (m, 4.6H), 4.42 (qt, J=8 Hz, 6.6H), 5.01 (qt, J=6.8 Hz, 1H), 5.16 (qt, J=7.2 Hz, 2.3H), 7.09-7.19 (m, 10H), 7.21-7.28 (m, 5H), 7.33-7.50 (m, 8.9H), 7.53 (dd, J=4.6, 9.1 Hz, 1H), 7.63-7.68 (m, 2.3H), 8.58 (dd, J=2.0, 8.0 Hz, 2.3H), 8.61 (dd, J=2.0, 8.0 Hz, 1H), 8.96 (dd, J=2.0, 4.4 Hz, 2.3H), 9.06 (dd, J=2.0, 4.8 Hz, 1H) ppm. MS(ESI⁺) m/z=688.9 [M+H]⁺. Analytical calculated: 52.33% C, 3.95% H, 19.31% F, 8.14% N. Found: 52.29% C, 3.97% H, 19.40% F, 8.12% N.

(R)—N-(2-Ethanesulfonyl-ethyl)-2-(4-fluoro-3-trifluoromethyl-phenyl)-N-(1-{4-oxo-3-[4-(2,2,2-trifluoro-ethoxy)-phenyl]-3,4,5,6,7,8-hexahydro-pyrido[2,3-d]pyrimidin-2-yl}-ethyl)-acetamide (1). A mixture of A3 (58 mg, 0.084 mmol) and 10% palladium on carbon (18 mg, 0.017 mmol) in 2 mL of methanol was allowed to stir at room temperature under hydrogen balloon for 20 h. Upon completion, the mixture was filtered through a short column of celite, and the filtrate was concentrated in vacuo and dried to give 61 mg of 1. ¹H NMR: a mixture of cis/trans amide rotamers in ca. 3:1 ratio (400 MHz, CDCl₃; T=25° C.) δ_(major) 7.00-7.47 (m, 7H), 5.31 (br s, 1H), 4.71 (q, J=6.62 Hz, 1H), 4.36 (m, 2H), 3.89-4.02 (m, 1H), 3.69-3.76 (m, 1H), 3.36-3.44 (m, 3H), 2.91-3.04 (m, 3H), 2.51-2.66 (m, 2H), 1.87-1.92 (m, 2H), 1.37-1.43 (m, 4H), 1.33 (d, J=6.7 Hz, 3H) and δ_(minor) 5.15 (q, J=7.04 Hz, 1H), 4.77 (br s, 1H), 1.28 (d, J=7.08 Hz, 3H). MS (ESI⁺) 693 [M+H]⁺.

7.2 Example 2

(R)-2-(4-fluoro-3-trifluoromethyl-phenyl)-N-(2-methanesulfonyl-ethyl)-N-(1-{4-oxo-3-[4-(2,2,2-trifluoro-ethoxy)-phenyl]-3,4-dihydro-pyrido[2,3-d]pyrimidin-2-yl}-ethyl)-acetamide (B2). Compound B2 was synthesized in two steps from A1 following the previously described synthetic sequence for A3, substituting methyl vinyl sulfone for ethyl vinyl sulfone in the first step. ¹H NMR: a mixture of cis/trans amide rotamers in ca. 2.0:1 ratio (400 MHz; CDCl₃; T=298 K) δ_(major) 8.98 (dd, J=4.46, 1.78 Hz, 1H), 8.62 (dd, 7.69, 1.78 Hz, 1H), 7.66 (dd, J=9.71, 3.33 Hz, 1H), 7.10-7.46 (m, 7H), 5.14 (q, J=7.26 Hz, 1H), 4.41 (q, J=7.94 Hz, 2H), 3.64-4.24 (m, 5H), 3.10 (s, 3H), 2.47 (m, 1H), 1.46 (d, J=7.2 Hz, 3H) and δ_(minor) 9.06 (m, 1H), 8.63 (obscured dd, J=7.28, 1.63 Hz, 1H), 5.01 (q, J=6.64 Hz, 1H), 2.83 (s, 3H), 1.58 (d, J=6.71 Hz, 3H) ppm. MS (ESI⁺) 675 [M+H]⁺.

(R)-2-(4-Fluoro-3-trifluoromethyl-phenyl)-N-(2-methanesulfonyl-ethyl)-N-(1-{4-oxo-3-[4-(2,2,2-trifluoro-ethoxy)-phenyl]-3,4,5,6,7,8-hexahydro-pyrido[2,3-d]pyrimidin-2-yl}-ethyl)-acetamide (2). Compound 2 was synthesized from B2 following the same synthetic procedures for 1. ¹H NMR: a mixture of cis/trans amide rotamers in ca. 3:1 ratio (400 MHz, CDCl₃; T=25° C.) δ_(major) 7.00-7.48 (m, 7H), 5.30 (br s, 1H), 4.73 (q, J=6.85 Hz, 1H), 4.38 (m, 2H), 3.90-3.95 (m, 1H), 3.73-3.76 (m, 1H), 3.36-3.44 (m, 3H), 2.91-3.03 (m, 5H), 2.53-2.64 (m, 3H), 1.86-1.93 (m, 2H), 1.34 (d, J=6.78 Hz, 3H) and δ_(minor) 5.22 (m, 1H), 1.29 (d, J=7.16 Hz, 3H). MS (ESI⁺) 679 [M+H]⁺.

7.3 Example 3

Intermediate C3 was synthesized from commercially available C1 in two steps as shown in Scheme C.

2,5-Dimethyl-2H-pyrazol-3-yl)-methanol (C2). Lithium aluminum hydride (1.0M in tetrahydrofuran, 1.78 mL) solution was added to commercially available ethyl 1,3-dimethyl-1H-pyrazole-5-carboxylate (C1, 300 mg, 1.78 mmol) in tetrahydrofuran over 5 min at room temperature. The reaction stirred overnight. In succession water (67 μL), 15% aqueous sodium hydroxide (202 μL), water (67 μL) were added. The resulting solid was filtered and dried in vacuo, then purified by chromatography (3% to 7% methanol in dichloromethane) to yield 175 mg of a colorless solid, C2.

5-Bromomethyl-1,3-dimethyl-1H-pyrazole (C3). Bromine (229 mg, 1.44 mmol) in dichloromethane was added to a solution of triphenylphosphine (376 mg, 1.44 mmol) in dichloromethane that had been cooled with an ice-water bath. The reaction stirred for 10 min, then C2 (170 mg, 1.34 mmol) was added all at once and the mixture was equilibrated to room temperature over 2 h. The reaction was quenched with water, then the aqueous layer was extracted with dichloromethane (2×25 mL). The combined organic layer was washed with 10% aqueous sodium thiosulfate, then brine. The organic layer was dried over magnesium sulfate, filtered, and concentrated in vacuo. Purified by chromatography (1:1 hexane:ethyl acetate) to yield 195 mg of a colorless solid, C3. ¹H NMR (400 MHz; CDCl₃; T=298 K): δ 6.07 ppm (s, 1H), 4.44 (s, 2H), 3.83 (s, 3H), 2.23 (s, 3H) ppm.

Compound D1, is previously described in International Publication No. WO 02/83143, Scheme 9, page 91. Compound 3 was synthesized from D1 in five steps as shown in Scheme D.

(R)-({1-[3-(4-Ethoxy-phenyl)-4-oxo-3,4,5,6,7,8-hexahydro-pyrido[2,3-d]pyrimidin-2-yl]-ethyl}-carbamic acid tert-butyl ester (D2). Compound D1 (370 mg, 0.90 mmol) was dissolved in methanol and degassed with nitrogen for 15 min. Palladium (10% wt. on activated carbon, 190 mg) was added, then the system was placed under hydrogen atmosphere with a balloon. The reaction stirred overnight at room temperature, then it was filtered through Celite, and concentrated in vacuo. Purified by chromatography (5% methanol in dichloromethane), yielding 387 mg of a colorless solid, D2.

(R)-{1-[8-Acetyl-3-(4-ethoxy-phenyl)-4-oxo-3,4,5,6,7,8-hexahydro-pyrido[2,3-d]pyrimidin-2-yl]-ethyl}-carbamic acid tert-butyl ester (D3). D2 (263 mg, 0.63 mmol) and N,N-diisopropylethylamine (111 μL, 0.63 mmol) were dissolved in acetic anhydride (10 mL) and heated to 80° C. The reaction stirred overnight. It was quenched with saturated aqueous sodium bicarbonate, then extracted with dichloromethane. The organic layer was washed with saturated aqueous sodium bicarbonate and brine, then dried over magnesium sulfate, filtered, concentrated in vacuo. Purified by chromatography (1:1 to 1:2 hexane:ethyl acetate), recovering 168 mg of D3.

(R)-8-Acetyl-2-(1-amino-ethyl)-3-(4-ethoxy-phenyl)-5,6,7,8-tetrahydro-3H-pyrido[2,3-d]pyrimidin-4-one (D4). D3 (268 mg, 0.59 mmol) was dissolved in 1:1 trifluoroacetic acid:dichloromethane (10 mL). The reaction stirred at room temperature for 30 min. The solvent was removed in vacuo, then 10% aqueous ammonium hydroxide was added until the aqueous pH=9. The aqueous layer was extracted three times with dichloromethane, then the combined organic layer was washed with saturated aqueous sodium bicarbonate and brine. It was dried over magnesium sulfate, filtered, and concentrated in vacuo, recovering 170 mg of D4. MS (MH+): 357.1. ¹H NMR (400 MHz; CDCl₃; T=298 K): δ 7.13 (ddd, 2H, J=18.9, 1.4, 1.1 Hz), 7.02 (ddd, 2H, J=9.0, 1.2, 0.8 Hz), 4.09 (dq, 2H, J=6.9, 1.2 Hz), 3.98-3.80 (ddq, 2H, J=62.6, 5.3, 1.0 Hz), 3.73 (dd, 1H, J=6.6, 1.2 Hz), 2.60 (s, 3H), 1.92 (m, 2H), 1.82 (broad s, 2H), 1.45 (ddd, 3H, J=8.3, 6.1, 1.3 Hz), 1.28-1.21 (m, 5H) ppm.

(R)-8-Acetyl-2-{1-[(2,5-dimethyl-2H-pyrazol-3-ylmethyl)-amino]-ethyl}-3-(4-ethoxy-phenyl)-5,6,7,8-tetrahydro-3H-pyrido[2,3-d]pyrimidin-4-one (D5). D4 (70 mg, 0.20 mmol), C3 (37 mg, 0.20 mmol), and potassium carbonate (30 mg, 0.22 mmol) were stirred in dimethylformamide at room temperature overnight. The reaction mixture was partitioned between 4:1 ether:dichloromethane and water. The organic layer was washed with water and brine. It was dried over magnesium sulfate, filtered, then concentrated in vacuo. Purified by chromatography (2% to 5% methanol with 0.1% ammonium hydroxide in dichloromethane), yielding 55 mg of D5.

(R)—N-{1-[8-Acetyl-3-(4-ethoxy-phenyl)-4-oxo-3,4,5,6,7,8-hexahydro-pyrido[2,3-d]pyrimidin-2-yl]-ethyl}-N-(2,5-dimethyl-2H-pyrazol-3-ylmethyl)-2-(4-fluoro-3-trifluoromethyl-phenyl)-acetamide (3). 4-fluoro-3-trifluoromethylphenylacetic acid (45 mg, 0.20 mmol) was dissolved in dichloromethane and cooled to 0° C. Oxalyl chloride (18 μL, 0.20 mmol) was added, then after 5 min, dimethylformamide (1.6 μL, 0.02 mmol) was added. The reaction stirred at 0° C. for 30 min and room temperature for 1 h. The solution was added slowly to a mixture of D5 (55 mg, 0.12 mmol) and triethylamine (50 μL, 0.36 mmol) in dichloromethane at −78° C. This stirred for 30 min, then was washed with saturated aqueous sodium bicarbonate and brine. It was dried over magnesium sulfate, filtered, and concentrated in vacuo. Purified by reverse-phase HPLC to yield 49 mg of a colorless solid, 3. MS (MH+): 669.1. ¹H NMR (500 MHz; CDCl₃; T=298 K): δ 7.47-7.02 (m, 7H), 5.74-5.42 (m, 1H), 5.30-5.04 (m, 1H), 4.63-4.31 (m, 2H), 4.09-3.86 (m, 3H), 3.75-3.59 (m, 3H), 2.81-2.60 (m, 1H), 2.60-2.43 (m, 5H), 2.18 (m, 3H), 1.93 (broad s, 2H), 1.46 (t, 3H, J=6.7 Hz), 1.30 (t, 3H, J=7.7 Hz) ppm.

7.4 Example 4

The synthesis of compound E1 is described in International Publication No. WO 02/83143, Scheme 9, page 91. Compound 4 was synthesized from E1 in five steps as shown in Scheme E.

(R)-3-(4-Ethoxy-phenyl)-2-[1-(3-oxo-butylamino)-ethyl]-3H-pyrido[2,3-d]pyrimidin-4-one (E2). Previously described E1 (1.94 g, 6.25 mmol) and methyl vinyl ketone (520 μL, 6.25 mmol) were dissolved in methanol and stirred at 60° C. for 3 h. The methanol removed in vacuo. Purified by chromatography (3% to 8% methanol in dichloromethane), recovering 1.38 g of E2.

(R)—N-{1-[3-(4-Ethoxy-phenyl)-4-oxo-3,4-dihydro-pyrido[2,3-d]pyrimidin-2-yl]-ethyl}-2-(4-fluoro-3-trifluoromethyl-phenyl)-N-(3-oxo-butyl)-acetamide (E3). 4-fluoro-3-trifluoromethylphenylacetic acid (707 mg, 3.18 mmol) was dissolved in dichloromethane and cooled to 0° C. Oxalyl chloride (278 μL, 3.18 mmol) was added, then after 5 min, dimethylformamide (24.7 μL, 0.32 mmol) was added. The reaction stirred at 0° C. for 30 min and room temperature for 1 h. The solution was added slowly to a mixture of E2 (713 mg, 1.87 mmol) and triethylamine (784 μL, 5.62 mmol) in dichloromethane at −78° C. The reaction stirred for 30 min, then was washed with saturated aqueous sodium bicarbonate and brine. It was dried over magnesium sulfate, filtered, concentrated in vacuo. Purified by column (2% to 10% methanol in dichloromethane), to yield 859 mg of E3.

(R)—N-(3-Cyclobutylamino-butyl)-N-{1-[3-(4-ethoxy-phenyl)-4-oxo-3,4-dihydro-pyrido[2,3-d]pyrimidin-2-yl]-ethyl}-2-(4-fluoro-3-trifluoromethyl-phenyl)-acetamide (E4). E3 (67 mg, 0.11 mmol), cyclobutyl amine (14.7 μL, 0.17 mmol), and sodium triacetoxyborohydride (73 mg, 0.34 mmol) were stirred in dichloroethane at room temperature for 3 h. The reaction mixture was diluted with dichloromethane, then washed with saturated aqueous sodium bicarbonate and brine. It was dried over magnesium sulfate, filtered, concentrated in vacuo. Purified by chromatography (4% to 10% methanol with 0.1% ammonium hydroxide in dichloromethane), recovering 31 mg of E4.

(R)—N-[3-(Cyclobutyl-methyl-amino)-butyl]-N-{1-[3-(4-ethoxy-phenyl)-4-oxo-3,4-dihydro-pyrido[2,3-d]pyrimidin-2-yl]-ethyl}-2-(4-fluoro-3-trifluoromethyl-phenyl)-acetamide (E5). E4 (31 mg, 0.048 mmol), formaldehyde (37% in water, 5.4 μL, 0.073 mmol), and sodium triacetoxyborohydride (31 mg, 0.15 mmol) was stirred in dichloroethane at room temperature for 45 min. The reaction mixture was diluted with dichloromethane, then washed with saturated aqueous sodium bicarbonate and brine. It was dried over magnesium sulfate, filtered, and concentrated in vacuo. 33 mg of E5 was recovered.

(R)—N-[3-(Cyclobutyl-methyl-amino)-butyl]-N-{1-[3-(4-ethoxy-phenyl)-4-oxo-3,4,5,6,7,8-hexahydro-pyrido[2,3-d]pyrimidin-2-yl]-ethyl}-2-(4-fluoro-3-trifluoromethyl-phenyl)-acetamide (4). E5 (33 mg, 0.048 mmol) was dissolved in methanol and degassed with nitrogen for 5 min. Palladium (10% wt. on C, 33 mg) was added, then the reaction was placed under hydrogen atmosphere with a balloon. It was stirred for 2 h at room temperature, then filtered through Celite, and concentrated in vacuo. Purified by reverse-phase HPLC to yield 16 mg, a colorless solid, 4. MS (MH+): 658.3. ¹H NMR (400 MHz; CDCl₃; T=298 K): δ 7.40 (m, 1H), 7.14 (m, 4H), 6.89 (dd, 2H, J=8.7, 22.9 Hz), 5.21 (m, 1H), 4.81 (m, 1H), 4.02 (dd, 2H, J=15.9, 9.9 Hz), 3.57 (d, 1H, J=9.6 Hz), 3.39 (m, 2H), 3.21 (m, 2H), 3.03 (m, 1H), 2.76 (d, 1H, J=14.8 Hz), 2.56 (m, 2H), 2.20 (dd, 1H, J=25.0, 15.8 Hz), 1.97 (d, 3H, J=11.2 Hz), 1.88 (s, 3H), 1.74 (m, 3H), 1.64 (m, 3H), 1.40 (d, 4H, J=10.8 Hz), 1.30 (d, 6H, J=18.8 Hz) ppm.

7.5 Example 5

Compound 5 was synthesized from previously described compound E1 in three steps as shown in Scheme F.

(R)-3-(4-Ethoxy-phenyl)-2-[1-(1-isopropyl-piperidin-4-ylamino)-ethyl]-3H-pyrido[2,3-d]pyrimidin-4-one (F1) Compound E1 (1.13 g, 3.64 mmol), 1-isopropyl-4-piperidone (812 μL, 5.46 mmol), and sodium triacetoxyborohydride (2.26 g, 10.7 mmol) were stirred in dichloroethane at room temperature for 6 h. The reaction mixture was diluted with dichloromethane, then washed with saturated aqueous sodium bicarbonate and brine. It was dried over magnesium sulfate, filtered, and concentrated in vacuo. 1.58 g of F1 was recovered. MS (MH+): 436.5. ¹H NMR (500 MHz; CDCl₃; T=298 K): δ 9.01 (dd, 1H, J=4.6, 1.9 Hz), 8.62 (dd, 1H, J=7.9, 2.0 Hz), 7.45 (dd, 1H, J=7.9, 4.6 Hz), 7.14 (d, 2H, J=9.9 Hz), 7.08 (dd, 2H, J=5.3, 2.8 Hz), 4.13 (q, 2H, J=7.0 Hz), 3.64 (q, 1H, J=6.5 Hz), 2.82 (m, 2H), 2.75 (broad s, 1H), 2.36 (broad s, 1H), 2.18 (broad s, 3H), 1.71 (broad d, 2H), 1.49 (dt, 4H, J=7.0, 2.5 Hz), 1.32 (dd, 5H, J=19.0, 12.6 Hz), 1.05 (d, 6H, J=6.1 Hz) ppm.

(R)—N-{1-[3-(4-Ethoxy-phenyl)-4-oxo-3,4-dihydro-pyrido[2,3-d]pyrimidin-2-yl]-ethyl}-2-(4-fluoro-3-trifluoromethyl-phenyl)-N-(1-isopropyl-piperidin-4-yl)-acetamide (F2) 4-fluoro-3-trifluoromethylphenylacetic acid (1.35 g, 6.09 mmol) was dissolved in dichloromethane and cooled to 0° C. Oxalyl chloride (531 μL, 6.09 mmol) was added, then after 5 min, dimethylformamide (47.1 μL, 0.61 mmol) was added. The reaction was stirred at 0° C. for 30 min, then room temperature for 1 h. The solution was added slowly to a mixture of F1 (1.56 g, 3.58 mmol) and triethylamine (1.50 mL, 10.7 mmol) in dichloromethane at −78° C. It was stirred for 30 min, then washed with saturated aqueous sodium bicarbonate and brine. The reaction was dried over magnesium sulfate, filtered, and concentrated in vacuo. Purified by column (5% to 7% methanol with 0.1% ammonium hydroxide in dichloromethane), recovering 1.27 g of F2.

(R)—N-{1-[3-(4-Ethoxy-phenyl)-4-oxo-3,4,5,6,7,8-hexahydro-pyrido[2,3-d]pyrimidin-2-yl]-ethyl}-2-(4-fluoro-3-trifluoromethyl-phenyl)-N-(1-isopropyl-piperidin-4-yl)-acetamide (5). F2 (665 mg, 1.09 mmol) was dissolved in methanol and degassed with nitrogen for 5 min. Palladium (10% wt. on C, 665 mg) was added, then the reaction was placed under hydrogen atmosphere with a balloon. The reaction stirred overnight at room temperature, then it was filtered through Celite, and concentrated in vacuo. Purified by reverse-phase HPLC to yield 280 mg of a colorless solid, 5. MS (MH+): 644.5. ¹H NMR (400 MHz; CDCl₃; T=298 K): δ 7.10 (m, 7H), 5.08 (broad s, 1H), 4.70 (dd, 1H, J=11.2, 5.0 Hz), 4.01 (quint, 2H, 6.8 Hz), 3.67 (broad s, 1H), 3.42 (s, 3H), 3.14 (broad s, 3H), 2.67 (broad m, 3H), 2.55 (t, 3H, J=6.2 Hz), 2.29 (broad s, 2H), 1.90 (dd, 3H, J=5.6, 2.5 Hz), 1.39 (t, 6H, J=6.9 Hz), 1.25 (d, 6H, 6.4 Hz) ppm.

7.6 Example 6

Example 6 was synthesized from D2 in four steps as shown in Scheme G.

(R)-{1-[3-(4-Ethoxy-phenyl)-8-methyl-4-oxo-3,4,5,6,7,8-hexahydro-pyrido[2,3-d]pyrimidin-2-yl]-ethyl}-carbamic acid tert-butyl ester (G1). A mixture of 124 mg D2 (0.30 mmol, 1.00 equiv.), 489 mg cesium carbonate (1.50 mmol, 5.00 equiv.) and 93 μL iodomethane (1.50 mmol, 5.00 equiv.) in DMF was heated at 90° C. in a capped vial for 24 h. The reaction mixture was poured into water and th aqueous layer extracted with 3×20 mL 3:1 diethyl ether:dichloromethane. The combined organic extracts were washed with 3×20 mL water then 20 mL brine, dried over magnesium sulfate, filtered and concentrated in vacuo to afford a glassy yellow solid. The product G1 was purified by reversed-phase HPLC.

(R)-2-(1-Amino-ethyl)-3-(4-ethoxy-phenyl)-8-methyl-5,6,7,8-tetrahydro-3H-pyrido[2,3-d]pyrimidin-4-one (G2) To a solution of 110 mg G1 (0.26 mmol, 1.00 equiv.) dissolved in 2 mL dichloromethane cooled by an ice-bath was added 4 mL trifluoroacetic acid all at once. The reaction was equilibrated to room temperature. After 40 min. the reaction was concentrated in vacuo and the concentrate was partitioned between 25 mL each dichloromethane and saturated aqueous sodium bicarbonate. The aqueous separation was extracted again with 25 mL dichloromethane. Combined organic extracts were dried over magnesium sulfate, filtered and concentrated in vacuo to afford G4 as a faint yellow glassy solid, 83 mg. The product was used in the next step without further purification.

(R)-2-{1-[(2,5-Dimethyl-2H-pyrazol-3-ylmethyl)-amino]-ethyl}-3-(4-ethoxy-phenyl)-8-methyl-5,6,7,8-tetrahydro-3H-pyrido[2,3-d]pyrimidin-4-one (G3). A mixture of 83 mg G2 (0.25 mmol, 1.00 equiv.), 48 mg 5-bromomethyl-1,3-dimethyl-1H-pyrazole (C3) (0.25 mmol, 1.00 equiv.) and 38 mg potassium carbonate (0.28 mmol, 1.10 equiv.) in DMF was stirred for 44 h at room temperature then partitioned between 20 mL each water and 3:1 diethyl ether:dichloromethane. The separated aqueous layer was extracted with 2×20 mL 3:1 diethyl ether:dichloromethane. The combined organic extracts were washed with 3×20 mL water and 20 mL brine. The organic separation was dried over magnesium sulfate, filtered and concentrated in vacuo to afford a yellow glassy solid. The product was purified by column chromatography on silica gel, eluting with 4% methanol in dichloromethane. Purified product G3 isolated as an off-white solid, 73 mg.

(R)—N-(2,5-Dimethyl-2H-pyrazol-3-ylmethyl)-N-{1-[3-(4-ethoxy-phenyl)-8-methyl-4-oxo-3,4,5,6,7,8-hexahydro-pyrido[2,3-d]pyrimidin-2-yl]-ethyl)-2-(4-fluoro-3-trifluoromethyl-phenyl)-acetamide (6). The acid chloride (4-fluoro-3-trifluoromethyl-phenyl)acetyl chloride was prepared by addition of one drop of DMF to an ice-cold solution of 63 mg (4-fluoro-3-trifluoromethyl-phenyl)acetic acid (0.28 mmol, 1.70 equiv.) and 24 μL oxalyl chloride (0.28 mmol, 1.70 equiv.) dissolved in 2 mL dichloromethane. Gas evolution ensued and the reaction was equilibrated to room temperature and stirred for 2 h until gas evolution ceased. This solution was added dropwise over 5 min. to a solution of 73 mg G3 (0.17 mmol, 1.00 equiv.) and 81 μL triethylamine (0.59 mmol, 3.50 equiv.) dissolved in 2 mL dichloromethane cooled by an acetone-dry ice bath. The resulting mixture was stirred at low temperature for 20 min. then poured into saturated aqueous sodium bicarbonate. The organic separation was washed with brine, dried over magnesium sulfate, filtered, and concentrated in vacuo to afford a glassy solid. The product was purified by chromatography on silica gel, eluting with 4% methanol in dichloromethane. Purified product 6 was isolated as a colorless solid. ¹H NMR (500 MHz; CDCl₃; T=300 K) (mixture of S-cis:S-trans amide rotamers in ca. 1.3:1 ratio} δ1.20-1.50 (m, 18.7H), 1.70-1.87 (m, 1.7H), 1.87-2.00 (m, 5.8H), 2.12-2.28 (m, 8.7H), 2.47-2.69 (m, 6.3H), 2.90 (d, J=16.5 Hz, 1H), 2.96 (s, 4H), 3.21 (s, 3H), 3.28-3.43 (m, 5H), 3.62 (dd, J=17.5, 17.5 Hz, 3.3H), 3.69-3.83 (m, 8.3H), 3.98-4.12 (m, 5.5H), 4.33 (d, J=15.9 Hz, 1H), 4.52-4.67 (m, 2.5H), 4.79 (d, J=18.6, 1.3H), 4.84-4.93 (m, 1H), 5.33-5.40 (m, 1.3H), 5.55 (s, 1H), 5.81 (s, 1.3H), 6.87-7.23 (m, 14.3H), 7.30-7.38 (m, 2.5H), 7.44 (d, J=8.3 Hz, 1.7H) ppm. MS(ESI⁺) m/z=641.0 [M+H]⁺.

7.7 Example 7

Compound 7 was synthesized from the known compound 2-oxo-cyclohexanecarboxylic acid (4-ethoxy-phenyl)-amide (H1) in seven steps as shown in Scheme H.

2-Oxo-cyclohexanecarboxylic acid (4-ethoxy-phenyl)-amide (H2). A mixture of H1 (2.93 g, 20.6 mmol), p-phenetidine (2.92 mL, 22.67 mmol), EDC (5.91 g, 30.9 mmol), HOBT (1.58 g, 10.3 mmol) and 3.6 mL of NMM in 51 mL of dichloromethane was allowed to stir at room temperature for 2 days. Upon completion, the mixture was concentrated and 30 mL of 2N aqueous hydrochloric acid solution was added. The resulting mixture was extracted with ethyl acetate (30 mL×3). The combined extracts were washed with water and brine, dried over anhydrous sodium sulfate and concentrated. The material was purified by chromatography on a silica gel column using 10% and 20% ethyl acetate/hexane successively as the eluents to give 2.91 g of product H2. ¹H NMR (400 MHz, CDCl₃) δ: 9.16 (s, 1H), 7.43 (d, J=8.87 Hz, 2H), 6.83 (d, J=8.87 Hz, 2H), 4.00 (m, 2H), 3.30 (dd, J=10.5, 5.57 Hz, 1H), 1.72-2.57 (m, 8H), 1.39 (dd, J=7.0, 7.0 Hz, 3H). MS (ESI⁺) 284 [M+Na]⁺, 262 [M+H]⁺.

2-Amino-cyclohex-1-enecarboxylic acid (4-ethoxy-phenyl)-amide (H3). A mixture of H2 (1.52 g, 5.81 mmol) and 30 mL of 28% ammonia aqueous solution was refluxed for 16 h. The mixture was then cooled to room temperature and was extracted with dichloromethane (40 mL×3). The combined extracts were dried over anhydrous sodium sulfate and concentrated. The product was purified by column chromatography using 30% ethyl acetate/hexane as the eluent to give 1.46 g of H3. ¹H NMR (400 MHz, CDCl₃) δ: 7.35 (d, J=6.94 Hz, 2H), 6.93 (br s, 1H), 6.85 (d, J=6.94 Hz, 2H), 6.39 (br s, 1H), 4.0 (m, 2H), 2.21-2.34 (m, 4H), 1.66-1.74 (m, 4H), 1.39 (dd, J=7.0, 7.0 Hz, 3H).

(R)-{1-[2-(4-Ethoxy-phenylcarbamoyl)-cyclohex-1-enylcarbamoyl]-ethyl}-carbamic acid tert-butyl ester (H4). A mixture of 2-amino-cyclohex-1-enecarboxylic acid (4-ethoxy-phenyl)-amide (1.46 g, 5.60 mmol), N-Boc-D-alanine (1.06 g, 5.60 mmol), EDC (1.60 g, 8.4 mmol), HOBT (151 mg, 1.12 mmol) and 1.0 mL of N-methylmorpholine in 30 mL of methylene chloride was allowed to stir at room temperature for 28 h. Upon completion, the mixture was concentrated and 30 mL of saturated aqueous sodium bicarbonate was added. The resulting mixture was extracted with ethyl acetate (30 mL×3). The combined extracts were washed with water and brine, dried over anhydrous sodium sulfate and concentrated. The material was purified by chromatography on a silica gel column using 30% ethyl acetate/hexane successively as the eluents to give 1.53 g of product H4. ¹H NMR (400 MHz, CDCl₃) δ: 12.95 (s, 1H), 7.36 (d, J=8.86 Hz, 2H), 7.25 (br s, 1H), 8.87 (d, J=8.95 Hz, 2H), 5.23 (br s, 1H), 4.13 (br s, 1H), 4.02 (q, J=7.0 Hz, 2H), 3.01 (br s, 2H), 2.37 (br s, 2H), 1.70 (m, 4H), 1.43 (s, 9H), 1.41 (dd, J=7.0, 7.0 Hz, 3H), 1.40 (obscured d, J=7.07 Hz, 3H). MS (ESI⁺) 432 [M+H]⁺.

(R)-{1-[3-(4-Ethoxy-phenyl)-4-oxo-3,4,5,6,7,8-hexahydro-quinazolin-2-yl]-ethyl}-carbamic acid tert-butyl ester (H5). A mixture of H4 (100 mg, 0.231 mmol) and triphenylphosphite (182 μL, 0.695 mmol) in 2 mL of pyridine was heated to 100° C. for 24 h. Upon completion, the mixture was concentrated and 15 mL of saturated aqueous sodium bicarbonate solution was added. The resulting mixture was extracted with ethyl acetate (30×3). The combined extracts were washed with water and brine, dried over anhydrous sodium sulfate and concentrated. The product was purified by reversed phase HPLC to give 52 mg of product H5. ¹H NMR (400 MHz, CDCl₃) δ: 7.19 (D, J=7.85 HZ, 1H), 7.10 (dd, J=8.63, 2.58 Hz, 1H), 6.97-7.04 m, 2H), 5.55 (br s, 1H), 4.47 (br s, 1H), 4.07 (m, 2H), 2.63 (dd, J=6.21, 5.81 Hz, 2H), 2.50 (dd, J=6.17, 6.01 Hz, 2H), 1.73-1.82 (m, 4H), 1.44 (obscured dd, J=7.0, 7.0 Hz, 3H), 1.42 (s, 9H), 1.19 (d, J=6.66 Hz, 3H) ppm. MS (ESI⁺) 414 [M+H]⁺.

(R)-2-(1-Amino-ethyl)-3-(4-ethoxy-phenyl)-5,6,7,8-tetrahydro-3H-quinazolin-4-one (H6). 1.0 mL of TFA was slowly added to a solution of H5 (52 mg, 0.225 mmol) in 5 mL of methylene chloride at 0° C. The resulting mixture was allowed to stir at room temperature for 2 h. Upon completion, 50 mL of saturated aqueous sodium bicarbonate solution was added and additional solid sodium bicarbonate was added until the mixture became slightly basic. The resulting mixture was extracted with methylene chloride (35 mL×3). The combined extracts were washed with saturated aqueous sodium bicarbonate solution (50 mL×2) and water, dried over anhydrous sodium sulfate and concentrated. The residue was dried to give 29 mg of product H6. ¹H NMR (400 MHz, CDCl₃) δ: 7.07-7.11 (m, 2H), 7.00 (dd, J=6.98, 2.02 Hz, 2H), 4.07 (q, J=6.98 Hz, 2H), 3.66 (q, J=6.41 Hz, 1H), 2.64 (dd, J=6.21, 5.96 Hz, 2H), 2.51 (dd, J=6.21, 6.0 Hz, 2H), 1.74-1.85 (m, 6H), 1.45 (dd, J=6.97, 6.97 Hz, 3H), 1.21 (d, J=6.56 Hz, 3H). MS (ESI⁺) 314 [M+H]⁺.

(R)-3-(4-Ethoxy-phenyl)-2-[1-(2-methanesulfonyl-ethylamino)-ethyl]-5,6,7,8-tetrahydro-3H-quinazolin-4-one (H7). A mixture of H6 (29 mg, 0.092 mmol) and methyl vinyl sulfone (11 μL, 0.12 mmol) in 2 mL of methanol was allowed to stir at room temperature for 3 days. The reaction was monitored by HPLC. Upon completion, the mixture was concentrated and dried to give 39 mg of product H7, which was used in next step without further purification. ¹H NMR (400 MHz, CDCl₃) δ: 6.99-7.08 (m, 4H), 4.08 (q, J=6.99 Hz, 2H), 3.38 (q, J=6.57 Hz,1H), 3.03-3.07 (m, 2H), 2.95 (s, 3H), 2.62 (dd, J=6.16, 5.91 Hz, 2H), 2.50 (dd, J=6.16, 5.92 Hz, 2H), 1.75-1.84 (m, 4H), 1.45 (dd, J=6.96, 6.96 Hz, 3H), 1.16 (d, J=6.59 Hz, 3H). MS (ESI⁺) 420 [M+H]⁺.

(R)—N-{1-[3-(4-Ethoxy-phenyl)-4-oxo-3,4,5,6,7,8-hexahydro-quinazolin-2-yl]-ethyl}-2-(4-fluoro-3-trifluoromethyl-phenyl)-N-(2-methanesulfonyl-ethyl)-acetamide (7) A mixture of H7 (39 mg, 0.092 mmol), 4-fluoro-3-trifluoromethylphenyl acetic acid (41 mg, 0.184 mmol), EDC (53 g, 0.276 mmol), HOBT (14 mg, 0.092 mmol) and 38 μL of NMM in 3 mL of methylene chloride was allowed to stir at room temperature for 3 days. Upon completion, the mixture was concentrated and 15 mL of water was added. The resulting mixture was extracted with ethyl acetate (30 mL×3). The combined extracts were washed with water and brine, dried over anhydrous sodium sulfate and concentrated. The material was purified by HPLC to give 28 mg of product 7. ¹H NMR (400 MHz): a mixture of cis/trans amide rotamers in ca. 3:1 ratio (CDCl₃; T=25° C.) δ_(major) 6.98-7.48 (m, 7H), 4.87 (q, J=6.84 Hz, 1H), 4.02-4.08 (m, 2H), 3.88 (m, 1H), 3.67 (m, 1H), 3.30 (m, 2H), 2.92 (s, 3H), 2.88 (m, 1H), 2.68-2.74 (m, 2H), 2.40-2.53 (m. 3H). 1.76-1.84 (m,4H), 1.43 (obscured t, J=6.82 Hz, 3H), 1.42 (obscured d, J=6.64 Hz, 3H) and δ_(minor)5.07 (q, J=7.2 Hz, 1H), 2.96 (s, 3H), 1.36 (d, J=7.2 Hz, 3H). MS (ESI⁺) 624 [M+H]⁺.

7.8 Example 8

Compound 8 was synthesized from known compound I1 in eight steps as shown in Scheme I.

4,4-Dimethyl-2-oxo-cyclohexanecarboxylic acid (4-ethoxy-phenyl) amide (I2). Compound I1, a mixture of 4-(5,5-dimethyl-cyclohex-1-enyl)-morpholine/4-(3,3-Dimethyl-cyclohex-1-enyl)-morpholine (3:1), (1.28 g, 6.55 mmol.) and 4-ethoxyphenyl isocyanate (1.20 g, 7.20 mmol.) in 32 mL of chloroform was stirred at room temperature for 20 h. Upon completion, 50 mL of dichloromethane was added and the resulting solution was washed with water twice and brine, dried over anhydrous sodium sulfate and concentrated. There was obtained 2.04 g of I2, which was used in next step without purification. MS (ESI⁺) 290 [M+H]⁺.

2-Amino-4,4-dimethyl-cyclohex-1-enecarboxylic acid (4-ethoxy-phenyl)-amide (13). A solution of 12 (2.04 g, 7.05 mmol.) in 20 mL of ethanol was saturated with anhydrous ammonia for 2 h of five successive days. The mixture was then concentrated and dried to give 1.98 g of product I3. ¹H NMR (400 MHz, CDCl₃) δ: 7.35 (dd, J=5.2, 0.8 Hz, 2H), 6.94 (br s, 1H), 6.82 (d, J=5.2 Hz, 2H), 6.37 (br s, 2H), 3.98 (m, 2H), 2.30 (dd, J=5.2, 4.8 Hz, 2H), 1.98 (s, 2H), 1.49 (dd, J=5.6, 5.2 Hz, 2H), 1.38 (dd, J=5.6, 5.6 Hz, 3H), 0.96 (s, 3H), 0.95 (s, 3H).

(R)-{1-[2-(4-ethoxy-phenylcarbamoyl)-5,5-dimethyl-cyclohex-1-enylcarbamoyl]-ethyl}-carbamic acid tert-butyl ester (I4). A mixture of I3 (1.02 g, 3.53 mmol), N-Boc-D-alanine (803 mg, 42.4 mmol), EDC (1.01 g, 5.29 mmol), HOBT (542 mg, 3.53 mmol) and 822 μL of NMM in 39 mL of dichloromethane was allowed to stir at room temperature for 28 h. Upon completion, the mixture was concentrated and 30 mL of saturated aqueous sodium bicarbonate was added. The resulting mixture was extracted with ethyl acetate (30 mL×3). The combined extracts were washed with water and brine, dried over anhydrous sodium sulfate and concentrated. The material was purified by chromatography on a silica gel column using 20% and 30% ethyl acetate/hexane successively as the eluents to give 1.06 g of product I4. ¹H NMR (400 MHz, CDCl₃) δ: 13.0 (s, 1H), 7.36 (d, J=8.8 Hz, 2H), 7.33 (br s, 1H), 6.85 (d, J=8.92 Hz, 2H), 5.30 (br s, 1H), 4.11 (br s, 1H), 3.99 (q, J=6.96 Hz, 2H), 2.79 (s, 2H), 2.36 (br s, 2H), 1.46 (m, 2H), 1.41 (s, 9H), 1.39 (dd, J=7.0, 7.0 Hz, 3H), 0.97 (s, 3H), 0.96 (s, 3H). MS (ESI⁺) 482 [M+Na]⁺.

(R)-{1-[3-(4-ethoxy-phenyl)-7,7-dimethyl-4-oxo-3,4,5,6,7,8-hexahydro-quinazolin-2-yl]-ethyl}-carbamic acid tert-butyl ester (I5). A mixture of I4 (500 mg, 1.09 mmol) and triphenylphosphite (857 μL, 3.27 mmol) in 11 mL of pyridine was heated to 115° C. for 45 h. Upon completion, the mixture was concentrated and 20 mL of saturated aqueous sodium bicarbonate solution was added. The resulting mixture was extracted with ethyl acetate (30×3). The combined extracts were washed with water and brine, dried over anhydrous sodium sulfate and concentrated. The product was purified by column chromatography using 10%, 20% and 40% ethyl acetate/hexane successively as the eluents to give 387 mg of product I5. ¹H NMR (400 MHz, CDCl₃) δ: 6.97-7.21 (m, 4H), 5.29 (br s, 1H), 4.46 (br s, 1H), 4.06 (q, J=6.95 Hz, 2H), 2.53 (dd, J=6.5, 5.4 Hz, 2H), 2.42 (s, 2H), 1.51 (dd, J=6.5, 6.5 Hz, 2H), 1.43 (obscured dd, J=7.0, 7.0 Hz, 3H), 1.40 (s, 9H), 1.18 (d, J=6.7 Hz, 3H), 1.02 (s, 3H), 1.00 (s, 3H). MS (ESI⁺) 442 [M+H]⁺.

(R)-2-(1-amino-ethyl)-3-(4-ethoxy-phenyl)-7,7-dimethyl-5,6,7,8-tetrahydro-3H-quinazolin-4-one (I6). 1.5 mL of TFA was slowly added to a solution of 15 (320 mg, 0.724 mmol) in 7 mL of dichloromethane at 0° C. The resulting mixture was allowed to stir at room temperature for 2 h. Upon completion, 50 mL of saturated aqueous sodium bicarbonate solution was added and additional solid sodium bicarbonate was also added until the mixture became slightly basic. The resulting mixture was extracted with methylene chloride (35 mL×3). The combined extracts were washed with saturated aqueous sodium bicarbonate solution (50 mL×2) and water, dried over anhydrous sodium sulfate and concentrated. The residue was dried to give 268 mg of product I6 and it was used without further purification. MS (ESI⁺) 342 [M+H]⁺.

(R)-3-(4-ethoxy-phenyl)-2-[1-(2-methanesulfonyl-ethylamino)-ethyl]-7,7-dimethyl-5,6,7,8-tetrahydro-3H-quinazolin-4-one (I7). A mixture of I6 (92 mg, 0.269 mmol) and ethyl vinyl sulfone (42 mg, 0.350 mmol) in 2 mL of methanol was allowed to stir at room temperature for 3 days. The reaction was monitored by HPLC. Upon completion, the mixture was concentrated and dried to give 145 mg of product I7 and it was used in next step without purification. ¹H NMR (400 MHz, CDCl₃) δ: 6.99-7.09 (m, 4H), 4.08 (q, J=6.99 Hz, 2H), 3.39 (q, J=6.6 Hz, 1H), 3.07 (m, 2H), 2.54 (dd, J=6.60, 6.41 Hz, 2H), 2.42 (s, 2H), 1.53 (dd, J=6.54, 6.51 Hz, 2H), 1.45 (dd, J=7.0, 7.0 Hz, 3H), 1.37 (t, J=6.72 Hz, 3H), 1.17 (d, J=6.61 Hz, 3H), 1.03 (s, 3H), 1.02 (s, 3H). MS (ESI⁺) 462 [M+H]⁺.

(R)—N-(2-Ethanesulfonyl-ethyl)-N-{1-[3-(4-ethoxy-phenyl)-7,7-dimethyl-4-oxo-3,4,5,6,7,8-hexahydro-quinazolin-2-yl]-ethyl}-2-(4-fluoro-3-trifluoromethyl-phenyl)-acetamide (8). Compound 8 was synthesized following the same synthetic procedures previously described for 7. ¹H NMR for 8: a mixture of cis/trans amide rotamers in ca. 3:1 ratio (400 MHz, CDCl₃; T=25° C.) δ_(major) 6.97-7.48 (m, 7H), 4.84 (q, J=6.81 Hz, 1H), 4.01-4.07 (m, 2H), 3.82 (m, 1H), 3.65 (m, 1H), 3.25 (m, 1H), 2.97 (q, J=7.83 Hz, 2H), 2.87 (ABd, J_(AB)=16.3 Hz, 1H), 2.74 (m, 1H), 2.43-2.59 (m, 4H), 2.39 (ABd, J_(AB)=16.3 Hz, 1H), 1.49-1.56 (m, 2H), 1.41 (obscured dd, J=7.04, 7.04 Hz, 3H), 1.40 (obscured d, J=4.75 Hz, 3H), 1.36 (dd, J=7.45, 7.45 Hz, 3H), 1.05 (s, 3H), 1.02 (s, 3H) and δ_(minor) 5.17 (m, 1H), 1.30 (d, J=7.16 Hz, 3H), 0.99 (s, 3H), 0.97 (s, 3H). MS (ESI⁺) 666 [M+H]⁺.

7.9 Example 9

Compound 9 can be synthesized from 5, for example, as shown in above scheme.

7.10 Example 10

Compound 10 can be synthesized from 5, for example, as shown in the above scheme.

TABLE 2 Examples 11-16

Example R¹ R² 11 —OCH₂CF₃

12 —OCH₂CF₃

13 —OEt

14 —OEt

15 —OEt

16 —OEt

7.11 Examples 11-16

Intermediate compounds J2 and J3 were synthesized from previously described A1 in two and three steps respectively, as shown in Scheme J.

(R)-2-{1-[(Tetrahydro-thiopyran-4-ylmethyl)-amino]-ethyl}-3-[4-(2,2,2-trifluoro-ethoxy)-phenyl]-3H-pyrido[2,3-d]pyrimidin-4-one (J1). Previously described A1 (159 mg, 0.44 mmol), tetrahydrothiopyranyl-4-carboxaldehyde (70 μL, 0.53 mmol), and sodium triacetoxyborohydride (277 mg, 1.32 mmol) were stirred in 1,2-dichloroethane at room temperature for 1 h. The reaction mixture was diluted with dichloromethane, then washed with saturated aqueous sodium bicarbonate and brine. The organic layer was dried over anhydrous magnesium sulfate, filtered, and concentrated in vacuo, to afford 208 mg of J1, which was carried forward without purification.

(R)-2-(4-Fluoro-3-trifluoromethyl-phenyl)-N-(1-{4-oxo-3-[4-(2,2,2-trifluoro-ethoxy)-phenyl]-3,4-dihydro-pyrido[2,3-d]pyrimidin-2-yl}-ethyl)-N-(tetrahydro-thiopyran-4-ylmethyl)-acetamide (J2). The compound 4-fluoro-3-trifluoromethylphenylacetic acid (164 mg, 0.74 mmol) was dissolved in dichloromethane and cooled to 0° C. Oxalyl chloride (64 μL, 0.74 mmol) was added, then after 5 min, N,N-dimethylformamide (5.7 μL, 0.07 mmol) was added. The reaction stirred at 0° C. for 30 min. and room temperature for 1 h. The solution was added slowly to a mixture of J1 (208 mg, 0.43 mmol) and triethylamine (182 mL, 1.30 mmol) in dichloromethane at −78° C. The mixture was stirred for 30 min., then washed with saturated aqueous sodium bicarbonate and brine. The organic extract was dried over anhydrous magnesium sulfate, filtered, and concentrated in vacuo. The resulting product was purified by chromatography (2% methanol with 0.1% ammonium hydroxide in dichloromethane), yielding 265 mg of J2.

(R)—N-(1,1-Dioxo-hexahydro-1λ⁶-thiopyran-4-ylmethyl)-2-(4-fluoro-3-trifluoromethyl-phenyl)-N-(1-{4-oxo-3-[4-(2,2,2-trifluoro-ethoxy)-phenyl]-3,4-dihydro-pyrido[2,3-d]pyrimidin-2-yl}-ethyl)-acetamide (J3). Compound 4 (265 mg, 0.39 mmol) was dissolved in dichloromethane and cooled to 0° C. To this solution was added 3-chloroperoxybenzoic acid (77%, 174 mg, 0.78 mmol) and the mixture was equilibrated to room temperature overnight. The reaction was washed twice with 10% aqueous sodium thiosulfate, and once with brine. The organic layer was then dried over anhydrous magnesium sulfate, filtered, and concentrated in vacuo. The product was purified by chromatography (3% methanol with 0.1% ammonium hydroxide in dichloromethane), recovering 136 mg of 5. MS (MH+): 688.2. ¹H NMR (500 MHz; CDCl₃; T=298 K): δ 8.30 (t, 1H, J=7.9 Hz), 7.86 (m, 1H), 7.69-7.35 (m, 4H), 7.25 (m, 2H), 7.13 (m, 3H), 5.23-4.93 (dq, 1H, J=7.2, 143 Hz), 4.43 (quint, 2H, J=8.0 Hz), 4.22-3.58 (m, 2H), 3.26 (m, 1H), 3.06-2.97 (m, 3H), 1.55 (d, 2H, J=6.7 Hz), 1.43 (dt, 3H, J=7.6, 2.0 Hz), 1.32 (t, 3H, J=7.5 Hz) ppm.

Intermediate compound K1 was synthesized from the previously described E1 in two steps.

(R)—N-(2-benzenesulfonyl-ethyl)-N-{1-[3-(4-ethoxy-phenyl)-4-oxo-3,4-dihydro-pyrido[2,3-d]pyrimidin-2-yl]-ethyl}-2-(4-fluoro-3-trifluoromethyl-phenyl)-acetamide (K1). Compound K1 was synthesized in two steps from E1 following the synthetic sequence for A3, substituting phenyl vinyl sulfone for ethyl vinyl sulfone in step 1. ¹H NMR: a mixture of cis/trans amide rotamers in ca. 2.0:1 ratio (400 MHz, CDCl₃; T=25° C.) δ_(major) 8.98 (dd, J=4.63, 1.94 Hz, 1H), 8.61 (d, J=7.97, 1.80 Hz, 1H), 7.98 (d, J=7.43 Hz, 1H), 7.01-7.75 (m, 12H), 5.14 (q, J=7.20 Hz, 1H), 4.07 (m, 2H), 2.86-3.90 (m, 6H), 1.45 (obscured t, J=6.93 Hz, 3H), 1.34 (d, J=7.23 Hz, 3H) and δ_(minor) 9.09 (dd, J=4.3, 1.84 Hz, 1H), 8.64 (dd, J=7.88, 1.87 Hz, 1H), 1.54 (d, J=6.73 Hz, 3H), 1.44 (obscured t, J=6.74 Hz, 3H). MS (ESI⁺) 683 [M+H]⁺.

The intermediate compounds L2 and L3 were synthesized in two and three steps respectively from the previously described E1.

(R)-3-(4-ethoxy-phenyl)-2-{1-[(tetrahydro-thiopyran-4-ylmethyl)-amino]-ethyl}-3H-pyrido[2,3-d]pyrimidin-4-one (L1). To a mixture of E1 (531 mg, 1.71 mmol) and tetrahydro-thiopyran-4-carbaldehyde (234 mg, 1.79 mmol) in 9 mL of 1,2-dichloroethane was added 1.09 g (5.13 mmol) of sodium triacetoxyborohydride at room temperature. The resulting mixture was allowed to stir at room temperature for 3 h. Upon completion, 25 mL of saturated aqueous sodium bicarbonate solution was added, and the resulting mixture was extracted with dichloromethane (30 mL×3). The combined extracts were washed with water and brine, dried over anhydrous sodium sulfate and concentrated in vacuo. The residue was dried under vacuum to give 550 mg of desired product L1, which was used in next step without further purification. MS (ESI⁺) 425 [M+H]⁺.

(R)—N-{1-[3-(4-Ethoxy-phenyl)-4-oxo-3,4-dihydro-pyrido[2,3-d]pyrimidin-2-yl]-ethyl}-2-(4-fluoro-3-trifluoromethyl-phenyl)-N-(tetrahydro-thiopyran-4-ylmethyl)-acetamide (L2). A mixture of L1 (550 mg, 1.29 mmol), 4-fluoro-3-trifluoromethylphenyl acetic acid (374 mg, 1.68 mmol), EDC (371 mg, 1.93 mmol), HOBT (198 mg, 1.29 mmol) and 300 μL (2.58 mmol) of NMM in 13 mL of dichloromethane was allowed to stir at room temperature for 3 days. Upon completion, the mixture was concentrated and 15 mL of water was added. The resulting mixture was extracted with ethyl acetate (30 mL×3). The combined extracts were washed with water and brine, dried over anhydrous sodium sulfate and concentrated. The material was purified by chromatography on a silica gel column using 50% and 80% of ethyl acetate/hexane successively as the eluents to give 531 mg of product L2. ¹H NMR for a mixture of cis/trans amide rotamers in ca. 2:1 ratio (400 MHz, CDCl₃; T=25° C.) δ_(major) 8.96 (dd, J=4.58, 2.01 Hz, 1H), 8.56 (dd, J=7.87, 2.02 Hz, 1H), 7.0-7.55 (m, 8H), 5.16 (q, J=7.21 Hz, 1H), 4.05 (q, J=6.92 Hz, 2H), 1.44 (obscured d, J=7.19 Hz, 3H), 1.43 (obscured t, J=6.96 Hz, 3H) and δ_(minor) 9.06 (dd, J=4.56, 1.96 Hz, 1H), 8.63 (dd, J=7.90, 1.96 Hz, 1H), 5.02 (q, J=6.81 Hz, 1H), 1.58 (d, J=6.74 Hz, 3H). MS (ESI⁺) 629 [M+H]⁺.

(R)—N-(1,1-dioxo-hexahydro-1 X6-thiopyran-4-ylmethyl)-N-{1-[3-(4-ethoxy-phenyl)-4-oxo-3,4-dihydro-pyrido[2,3-d]pyrimidin-2-yl]-ethyl}-2-(4-fluoro-3-trifluoromethyl-phenyl)-acetamide (L3). To a solution of L2 (531 mg, 0.845 mmol) in 8 mL of dichloromethane was slowly added 379 mg (1.69 mmol) of 3-chloroperoxybenzoic acid (77%). The resulting mixture was allowed to stir at room temperature for 3 h. Upon completion, 30 mL of a saturated aqueous sodium thiosulfate solution was added, and the resulting mixture was extracted with dichloromethane (40 mL×3). The combined extracts were washed with a saturated aqueous sodium thiosulfate solution and water, dried over anhydrous sodium sulfate and concentrated in vacuo. The product was purified by column chromatography using 50% and 100% ethyl acetate/hexane successively as the eluents to give 484 mg of L3. ¹H NMR: a mixture of cis/trans amide rotamers in ca. 4:1 ratio (400 MHz, CDCl₃; T=25° C.) δ_(major) 3.60 (d, J=3.60 Hz, 1H), 8.85 (d, J=6.64 Hz, 1H), 7.04-7.68 (m, 8H), 5.13 (q, J=7.29 Hz, 1H), 4.10 (q, J=6.97 Hz, 2H), 3.90 (ABd, J_(AB)=16.3 Hz, 1H), 3.59-3.75 (m, 3H), 2.85-3.17 (m, 4H), 1.80-2.35 (m, 5H), 1.46 (J=6.95 Hz, 3H), 1.43 (d, J=7.43 Hz, 3H) and δ_(minor) 9.10 (m, 1H), 8.78 (m, 1H), 1.59 (d, J=6.74 Hz, 3H). MS (ESI⁺) 661 [M+H]⁺.

(R)—N-(2-Ethanesulfonyl-ethyl)-N-{1-[3-(4-ethoxy-phenyl)-4-oxo-3,4-dihydro-pyrido[2,3-d]pyrimidin-2-yl]-ethyl}-2-(4-fluoro-3-trifluoromethyl-phenyl)-synthesized acetamide (M1). Compound M1 was synthesized in two steps from E1 following the synthetic sequence for A3. ¹H NMR for M1: a mixture of cis/trans amide rotamers in ca. 1.2:1 ratio (400 MHz, CDCl₃; T=25° C.) δ_(major) 8.94 (dd, J=4.60, 2.00 Hz, 1H), 8.58 (dd, J=7.87, 1.99 Hz, 1H), 7.02-7.55 (m, 8H), 5.21 (m, 1H), 3.82-4.19 (m, 5H), 3.48 (m, 1H), 3.09-3.21 (m, 2H), 2.88-2.93 (m, 2H), 1.41-1.47 (m, 9H) and δ_(minor) 9.05 (dd, J=4.60, 2.02 Hz, 1H), 8.63 (dd, J=7.89, 1.98 Hz, 1H), 5.05 (m, 1H), 3.66 (m, 1H), 2.43 (ABd, J_(AB)=16.3 Hz, 1H), 1.58 (d, J=6.89 Hz, 3H), 1.22 (t, J=7.45 Hz, 3H). MS (ESI⁺) 635 [M+H]⁺.

Compounds 11-16 are synthesized from compounds J2, J3, K1, L2, L3 and M1, respectively, by contacting compound 4-9 with, for example, palladium on carbon at room temperature under hydrogen. Upon completion, the mixture can be filtered, concentrated and dried to give compounds 11-16.

7.12 Examples 17-22

TABLE 3 Examples 17-22

Example R¹ R² 17 —OCH₂CF₃

18 —OCH₂CF₃

19 —OEt

20 —OEt

21 —OEt

22 —OEt

7.13 Examples 23-27

TABLE 4 Examples 23-27

Example R¹ R² 23 —OCH₂CF₃

24 —OCH₂CF₃

25 —OEt

26 —OEt

27 —OEt

FIGS. 8 and 9 illustrate general synthetic schemes for the synthesis of substituted 5, 6, 7, 8-tetrahydro-7,7-dimethylquinazolin-4-(3H)-ones provided in Examples 23-27.

7.14 Examples 28-37

TABLE 5 Examples 28-37

Example R¹ R² 28 —OCH₂CF₃

29 —OCH₂CF₃

30 —OCH₂CF₃

31 —OCH₂CF₃

32 —OEt

33 —OEt

34 —OEt

35 —OEt

36 —OEt

37 —CF₃

7.15 Examples 38-47

TABLE 6 Examples 38-47

Example R¹ R² 38 —OCH₂CF₃

39 —OCH₂CF₃

40 —OCH₂CF₃

41 —OCH₂CF₃

42 —OEt

43 —OEt

44 —OEt

45 —CF₃

46 —OEt

47 —OCH₂CF₃

7.16 Examples 48-54

TABLE 7 Examples 48-54

Example R¹ R² 48 —OCH₂CF₃

49 —OCH₂CF₃

50 —OEt

51 —OEt

52 —OEt

53 —OEt

54 —CF₃

7.17 Examples 49-53

TABLE 8 Example 49-53

Example # X Y 49

50 —CH₂CH₂NH₂ —^(i)Pr 51 —CH₂CH₂NH^(i)Pr —^(i)Pr 52 —CH₂OH —H 53

—H

Compound 49 can be synthesized from compound N1 as shown in Scheme N. For example, pyridine-3-carbaldehyde is added to compound N1 in dichloroethane at −10° C., followed by sodium triacetoxy borohydride. The mixture is kept at that temperature for 1.5 h, warmed slowly to room temperature and stirred overnight. The solution is diluted with dichloromethane, washed by saturated aqueous sodium bicarbonate, water, brine and can be dried to yield compound N2. EDC is added to a mixture of compound N2,4-fluoro-3-trifluoromethylphenylacetic acid, HOBt and NMM in DMF. The mixture is stirred at room temperature overnight and can be diluted with ethyl acetate. The solution is washed by saturated aqueous sodium bicarbonate, water and brine, dried, concentrated, and compound 49 can be purified from the residue by chromatography.

7.18 Examples 54-58

TABLE 9 Examples 54-58

Example # X Y 54

55 —CH₂CH₂NH₂ —^(i)Pr 56 —CH₂CH₂NH^(i)Pr —^(i)Pr 57 —CH₂OH —H 58

—H

7.19 Examples 59-63

TABLE 10 Examples 59-63

Example # X Y 59

60 —CH₂CH₂NH₂ —^(i)Pr 61 —CH₂CH₂NH^(i)Pr —^(i)Pr 62 —CH₂OH —H 63

—H

7.20 Examples 64-66

TABLE 11 Examples 64-66

Example # X Y R 64 —N═

65 —NH— —CH₂CH₂—

66 —NMe— —CH₂CH₂—

Example 64 can be prepared from 49 by the addition of trifluoroacetic acid to a solution of compound 49 in dichloroethane which is then heated to 60° C. for 1.5 h. The solvent is evaporated, the residue is dissolved in ethyl acetate and washed with saturated aqueous sodium bicarbonate, water, brine and dried.

7.21 Examples 67-69

TABLE 12 Examples 67-69

Example # X Y R 67 —N═

68 —NH— —CH₂CH₂—

69 —NMe— —CH₂CH₂—

7.22 Examples 70-77

Examples 70-77 were prepared following the synthesis for examples described above, with slight modifications.

TABLE 1 Characterization (Mass) Example Structure MS + 1 70

647.7 71

634.7 72

648.7 73

673.7 74

673.7 75

639.7 76

667.8 77

634.7

7.23 CXCR3-binding and Migration Assays

CXCR3-binding Assay: The following example illustrates a CXCR3 binding assay that can be used for evaluating the compounds of the present invention, as described in Example 12 of International Publication No. WO 02/083143.

Unless otherwise noted, all reagents for the assay are available from commercial sources (e.g., Sigma-Aldrich, St. Louis, Mo., USA). Test compounds are diluted in DMSO to a concentration that is 40-times the intended final assay concentration; 5 μL are transferred to each well of a 96-well flat-bottomed polypropylene plate (e.g., from Greiner, Inc.). Cells expressing CXC3 (see International Publication No. WO 02/083143) are suspended in assay buffer (25 mM Hepes, 80 mM NaCl, 1 mM CaCl₂, 5 mM MgCl₂, 0.2% bovine serum albumin, pH 7.1, stored at 4° C.) at 5 million cells per mL; 100 μL of this cell suspension is transferred to each well of a 96-well plate containing the diluted test compounds. ¹²⁵I-labelled chemokine (purchased from commercial sources, e.g., Amersham, PE Life Sciences) is diluted in assay buffer to a concentration of approximately 60 pM; 100 μL of this chemokine solution is transferred to each well of a 96-well plate containing compounds and cell suspension. The plates can be sealed with commercially available foil plate seals (e.g., from E&K Scientific), and stored at 4° C. for a period of 2 to 4 h, shaking gently. At the end of this incubation period, the contents of the assay plates are transferred to GF/B filter plates (Packard) that have been pre-coated by dipping into a solution containing 0.3% polyethyleneimine (Sigma), using a cell harvester (Packard), and can be washed twice with wash buffer (25 mM Hepes, 500 mM NaCl, 1 mM CaCl₂, 5 mM MgCl₂, pH 7.1, stored at room temperature). The filter plates are sealed on the bottom with plate seals (Packard), 50 μL of Microscint-20 scintillation fluid (Packard) is added to each well, and the top of the plates are sealed with clear plastic (TopSeal A, Packard). The plates are counted on a scintillation counter, such as a Packard TopCount. To measure non-specific binding, 4 wells containing unlabelled “cold” chemokine can be included on each 96-well plate. To measure maximum binding, 4 wells containing 5 μL of DMSO, 100 μL of cell suspension and 100 μL of ¹²⁵I-labelled chemokine solution can be included on each 96-well plate. Data can be analyzed using commercially available software (e.g., Excel from Microsoft, Prism from GraphPad Software Inc.).

CXCR3 Plasma Migration Assay: The following example provides a CXCR3 plasma migration assay that can be used for evaluating the compounds of the present invention.

Human peripheral blood mononuclear cells (PBMCs) are activated with OKT3 (purified by AB solutions from hybridoma cell line OKT3 (ATCC CRL-8001)) and IL-2 (Peprotech, Inc., Rocky Hill, N.J., USA), and at fourteen days, the cells are loaded with chloromethyl-fluoroscein-diacetate (CMFDA) (Molecular Probes, Inc.) by incubating the activated PBMCs in 1 ng/mL CMFDA for >1.5 hours at 37° C. in a tissue culture incubator. While cells are loading, the test compounds can be diluted in DMSO to a concentration that is 100-times the intended final assay concentration. Next, 100 ng/mL of human ITAC (Peprotech) in human plasma (EDTA, drug free, Biological Specialty Corp) is prepared. Test compounds are added to the human ITAC preparation. Cells are washed once in prewarmed (37° C.) RPMI (Invitrogen) media with 0.5% BSA and resuspended to 5 million cells/ml in human plasma. The test compounds are added to the PBMCs. A 96-well chemotaxis migration plate (NeuroProbe, Inc.) is assembled by adding, per well, 30 uL of ITAC/compound mixture in the lower chamber, placing the impermeable membrane on top of the ITAC/compound well, and adding 50 uL of the PBMC/compound mixture to the well. The plates are covered and can be incubated in a humidified tissue culture incubator for 2.5 hours. A standard curve of CMFDA-loaded cells to be used as a reference for the test plates can be prepared. Migration plates are disassembled and are read in a flourometric plate reader set to 475 nm absorbance, 517 nm emission. The flouremetric reading can be converted to cell number using the standard curve and calculating the percentage of migrating cells.

Other assays may be used to identify compounds that modulate CXCR3 chemokine receptor activity, for example, binding assays (see, e.g., Weng et al. (1998) J. Biol. Chem. 273:18288-18291, Campbell et al. (1998) J. Cell Biol. 141:1053-1059, Endres et al. (1999) J. Exp. Med. 189:1993-1998 and Ng et al. (1999) J. Med. Chem. 42:4680-4694), calcium flux assays (see, e.g., Wang et al. (2000) Mol. Pharm. 57:1190-1198 and Rabin et al. (1999) J. Immunol. 162:3840-3850) and chemotaxis assays (see, e.g., Albanesi et al. (2000) J. Immunol. 165:1395-1402 and Loetscher et al. (1998) Eur. J. Immunol. 28:3696-3705), and other assays known to those of skill in the art.

All publications, patents and patent applications cited in this specification are herein incorporated by reference as if each individual publication or patent application were specifically and individually indicated to be incorporated by reference. Although the foregoing invention has been described in some detail by way of illustration and example for purposes of clarity of understanding, it will be readily apparent to those of ordinary skill in the art in light of the teachings of this invention that certain changes and modifications may be made thereto without departing from the spirit or scope of the appended claims. 

1. A compound having the formula (I):

or a pharmaceutically acceptable salt thereof, wherein Q is a member selected from the group consisting of —C(O)—, —CH₂CO—, —CH₂SO— and —CH₂SO₂—; L is a bond or (C₁-C₅)alkylene; A¹, A² and A³ are independently selected from the group consisting of C(R′)(R″) and C(O); A⁴ is C(R′)(R″) or N(R′″); each R′ and R″ is independently selected from the group consisting of hydrogen, halogen, (C₁-C₈)alkyl, (C₂-C₈)heteroalkyl, fluoro(C₁-C₄)alkyl, aryl, heteroaryl, aryl(C₁-C₈)alkyl and heteroaryl(C₁-C₈)alkyl, optionally, R′ and R″ groups on adjacent carbon atoms may be combined to form a 5- or 6-membered fused ring, and R′ and R″ groups attached to the same carbon atom may be combined to form a 3-8 membered spirocyclic ring; R′″ is selected from the group consisting of hydrogen, (C₁-C₈)alkyl and (C₂-C₈)heteroalkyl; R¹ is heteroaryl or aryl; R² is selected from the group consisting of hydrogen, halogen, (C₁-C₁₀)alkyl, (C₂-C₁₀)heteroalkyl, hetero(C₁-C₁₀)cycloalkyl, (C₁-C₁₀)alkylaryl and (C₂-C₁₀)heteroalkylaryl, optionally R² may be combined with L to form a 5-, 6-, 7- or 8-membered ring containing from 1 to 3 heteroatoms selected from the group consisting of N, O and S; R³ is absent or is a member selected from the group consisting of —H, —CHR⁶R⁷, S(O)_(m)R⁵, —S(O)_(m)N(R⁸)R⁹, —S(O)_(m)N(R⁸)CH₂R⁶, —N(R⁸)SO₂R⁵, —N(R⁸)CH₂R¹⁰,

 wherein R⁵ is selected from the group consisting of (C₁-C₈)alkyl, (C₂-C₈)heteroalkyl, aryl and heteroaryl; R⁶ and R⁷ independently are hydrogen, (C₁-C₈)alkyl or (C₂-C₈)heteroalkyl, R⁸ is hydrogen, (C₁-C₈)alkyl, (C₂-C₈)heteroalkyl, heteroaryl or aryl, R⁹ is (C₁-C₈)alkyl; R¹⁰ is aryl, Z is CH or N, X is a bond, (C₁-C₆)alkylene or (C₁-C₆)heteroalkylene, Y is (C₁-C₆)alkylene; the subscript m is 0, 1 or 2; or optionally, R³ may be combined with R² to form a 4-, 5-, 6-, 7- or 8-membered ring containing from 1 to 3 heteroatoms selected from the group consisting of N, O and S; and R⁴ is a member selected from the group consisting of (C₁-C₂₀)alkyl, (C₂-C₂₀)heteroalkyl, heteroaryl, aryl, heteroaryl(C₁-C₆)alkyl, heteroaryl(C₂-C₆)heteroalkyl, aryl(C₁-C₆)alkyl and aryl(C₂-C₆)heteroalkyl.
 2. The compound of claim 1, wherein R¹ is para-cyanophenyl.
 3. The compound of claim 1, having the formula (Ia):

or a pharmaceutically acceptable salt thereof.
 4. The compound of claim 3, wherein A⁴ is N(R′″).
 5. The compound of claim 3, wherein A¹, A² and A³ are C(R′)(R″).
 6. The compound of claim 3, having the formula (II):

or a pharmaceutically acceptable salt thereof, wherein each R^(a) is independently selected from the group consisting of halogen, (C₁-C₈)alkyl, (C₂-C₈)heteroalkyl, fluoro(C₁-C₄)alkyl, aryl, heteroaryl, aryl(C₁-C₈)alkyl and heteroaryl(C₁-C₈)alkyl, or optionally, R^(a) groups on adjacent carbon atoms may be combined to form a 5- or 6-membered fused ring, and R^(a) groups attached to the same carbon atom may be combined to form a 3-8 membered spirocyclic ring; and the subscript k is 0, 1, 2, 3 or
 4. 7. The compound of claim 6, wherein R′″ is —CH₃, —CH₂CH₃ or —C(O)CH₃.
 8. The compound of claim 6, wherein k is
 0. 9. The compound of claim 6, having the formula (III):

or a pharmaceutically acceptable salt thereof, wherein R¹¹ is selected from the group consisting of hydrogen, (C₁-C₈)alkyl and (C₂-C₈)heteroalkyl.
 10. The compound of claim 3, wherein A⁴ is C(R′)(R″).
 11. The compound of claim 10, wherein A¹, A² and A³ are C(R′)(R″).
 12. The compound of claim 11, having the formula (IV):

or a pharmaceutically acceptable salt thereof.
 13. The compound of claim 11, having the formula (V):

or a pharmaceutically acceptable salt thereof, wherein each R^(a) is independently selected from the group consisting of halogen, (C₁-C₈)alkyl, (C₂-C₈)heteroalkyl, fluoro(C₁-C₄)alkyl, aryl, heteroaryl, aryl(C₁-C₈)alkyl and heteroaryl(C₁-C₈)alkyl, optionally, R^(a) groups on adjacent carbon atoms may be combined to form a 5- or 6-membered fused ring, and R^(a) groups attached to the same carbon atom may be combined to form a 3-8 membered spirocyclic ring; and the subscript p is 0, 1, 2, 3 or
 4. 14. The compound of claim 13, having the formula (VI):

or a pharmaceutically acceptable salt thereof, wherein R¹¹ is selected from the group consisting of hydrogen, (C₁-C₈)alkyl and (C₂-C₈)heteroalkyl.
 15. The compound of claim 14, wherein R³ is a member selected from the group consisting of —H, —SO₂CH₃, —SO₂CH₂CH₃,


16. The compound according to claim 4 or 10, wherein -L-R³ when taken together is


17. The compound of claim 4 or 10, wherein R¹ is a unsubstituted or a meta- or para-substituted phenyl, wherein the substituting group is a halogen, (C₁-C₈)alkyl, (C₁-C₈)haloalkyl, oxy(C₁-C₈)alkyl, or oxy(C₁-C₈)haloalkyl.
 18. The compound of claim 4 or 10, wherein R¹ is a meta- or para-substituted phenyl, wherein the substituting group is a cyano.
 19. The compound of claim 4 or 10, wherein R² is a member selected from the group consisting of


20. The compound of claim 4 or 10, wherein Q is —C(O)—.
 21. The compound of claim 4 or 10, wherein L is a bond, —CH₂— or —CH₂CH₂—.
 22. The compound of claim 4 or 10, wherein -Q-R⁴ is


23. A pharmaceutical composition comprising the compound of claim 1 and a pharmaceutically acceptable carrier, diluent or excipient.
 24. The compound of claim 1, wherein the compound is a pharmaceutically acceptable salt. 